diff --git a/ChangeLog b/ChangeLog
index 2761674de..44c2d178d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,69 @@
+2010-09-04  BVK Chaitanya  <bvk.groups@gmail.com>
+
+	Support for passing block of commands as an argument to extcmds.
+
+	* Makefile.util.def: Rules for new test.
+	* tests/grub_script_blockarg.in: New test.
+	* grub-core/tests/test_blockarg.c: New file, block argument
+	command used in the test.
+
+	* include/grub/extcmd.h (grub_extcmd_context): New struct.
+	(grub_register_extcmd_prio): New function prototype.
+	(grub_extcmd_dispatcher): New function prototype.
+	* include/grub/command.h (GRUB_COMMAND_FLAG_BLOCKS): New command
+	type.
+	* include/grub/script_sh.h (struct grub_script): New members
+	`children', `next_siblings' and `refcnt' for block arguments and
+	reference counting.
+	(GRUB_SCRIPT_ARG_TYPE_BLOCK): New argument type.
+	(grub_script_arg): New member `script' for block argument.
+	(grub_script_argv): New member `script' for block argument.
+	(grub_parser_param): New member `scripts' for block argument.
+	(grub_script_mem_free): New extern function prototype.
+	(grub_script_ref): New function prototype.
+	(grub_script_unref): New function prototype.
+
+	* grub-core/normal/dyncmd.c (grub_dyncmd_dispatcher): Moved to
+	extcmd form to support block arguments.
+	* grub-core/script/argv.c: Block arguments support.
+	* grub-core/script/execute.c: Likewise.
+	* grub-core/script/lexer.c: Likewise.
+	* grub-core/script/main.c: Likewise.
+	* grub-core/script/script.c: Likewise.
+	* grub-core/script/parser.y: Likewise.  New `block' and `block0'
+	non-terminals.
+
+	* grub-core/commands/acpi.c: Update extcmd implementations with
+	grub_extcmd_context_t.
+	* grub-core/commands/cat.c: Likewise.
+	* grub-core/commands/echo.c: Likewise.
+	* grub-core/commands/extcmd.c: Likewise.
+	* grub-core/commands/hashsum.c: Likewise.
+	* grub-core/commands/hdparm.c: Likewise.
+	* grub-core/commands/help.c: Likewise.
+	* grub-core/commands/hexdump.c: Likewise.
+	* grub-core/commands/i386/cpuid.c: Likewise.
+	* grub-core/commands/i386/pc/drivemap.c: Likewise.
+	* grub-core/commands/i386/pc/halt.c: Likewise.
+	* grub-core/commands/i386/pc/sendkey.c: Likewise.
+	* grub-core/commands/iorw.c: Likewise.
+	* grub-core/commands/keystatus.c: Likewise.
+	* grub-core/commands/loadenv.c: Likewise.
+	* grub-core/commands/ls.c: Likewise.
+	* grub-core/commands/lspci.c: Likewise.
+	* grub-core/commands/memrw.c: Likewise.
+	* grub-core/commands/probe.c: Likewise.
+	* grub-core/commands/search_wrap.c: Likewise.
+	* grub-core/commands/setpci.c: Likewise.
+	* grub-core/commands/sleep.c: Likewise.
+	* grub-core/disk/loopback.c: Likewise.
+	* grub-core/hello/hello.c: Likewise.
+	* grub-core/loader/i386/bsd.c: Likewise.
+	* grub-core/loader/xnu.c: Likewise.
+	* grub-core/term/gfxterm.c: Likewise.
+	* grub-core/term/serial.c: Likewise.
+	* grub-core/tests/lib/functional_test.c: Likewise.
+
 2010-09-04  BVK Chaitanya  <bvk.groups@gmail.com>
 
 	Multi-line quoted strings support.
diff --git a/Makefile.util.def b/Makefile.util.def
index 35bcd81b2..6dfd9301d 100644
--- a/Makefile.util.def
+++ b/Makefile.util.def
@@ -501,6 +501,12 @@ script = {
   common = tests/grub_script_shift.in;
 };
 
+script = {
+  testcase;
+  name = grub_script_blockarg;
+  common = tests/grub_script_blockarg.in;
+};
+
 program = {
   testcase;
   name = example_unit_test;
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index b953adfb9..e27152706 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -1380,3 +1380,8 @@ module = {
   name = datehook;
   common = hook/datehook.c;
 };
+
+module = {
+  name = test_blockarg;
+  common = tests/test_blockarg.c;
+};
\ No newline at end of file
diff --git a/grub-core/commands/acpi.c b/grub-core/commands/acpi.c
index 884ddf000..1f17b63d6 100644
--- a/grub-core/commands/acpi.c
+++ b/grub-core/commands/acpi.c
@@ -458,10 +458,9 @@ free_tables (void)
 }
 
 static grub_err_t
-grub_cmd_acpi (struct grub_extcmd *cmd,
-		      int argc, char **args)
+grub_cmd_acpi (struct grub_extcmd_context *ctxt, int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   struct grub_acpi_rsdp_v10 *rsdp;
   struct efiemu_acpi_table *cur, *t;
   grub_err_t err;
diff --git a/grub-core/commands/cat.c b/grub-core/commands/cat.c
index 77a4cc793..a70118517 100644
--- a/grub-core/commands/cat.c
+++ b/grub-core/commands/cat.c
@@ -33,9 +33,9 @@ static const struct grub_arg_option options[] =
   };
 
 static grub_err_t
-grub_cmd_cat (grub_extcmd_t cmd, int argc, char **args)
+grub_cmd_cat (grub_extcmd_context_t ctxt, int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   int dos = 0;
   grub_file_t file;
   char buf[GRUB_DISK_SECTOR_SIZE];
diff --git a/grub-core/commands/echo.c b/grub-core/commands/echo.c
index 4fea091cb..6bc00eae8 100644
--- a/grub-core/commands/echo.c
+++ b/grub-core/commands/echo.c
@@ -30,9 +30,9 @@ static const struct grub_arg_option options[] =
   };
 
 static grub_err_t
-grub_cmd_echo (grub_extcmd_t cmd, int argc, char **args)
+grub_cmd_echo (grub_extcmd_context_t ctxt, int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   int newline = 1;
   int i;
 
diff --git a/grub-core/commands/extcmd.c b/grub-core/commands/extcmd.c
index 16796febf..ecf2d4133 100644
--- a/grub-core/commands/extcmd.c
+++ b/grub-core/commands/extcmd.c
@@ -21,20 +21,31 @@
 #include <grub/list.h>
 #include <grub/misc.h>
 #include <grub/extcmd.h>
+#include <grub/script_sh.h>
 
-static grub_err_t
-grub_extcmd_dispatcher (struct grub_command *cmd,
-			int argc, char **args)
+grub_err_t
+grub_extcmd_dispatcher (struct grub_command *cmd, int argc, char **args,
+			struct grub_script *script)
 {
   int new_argc;
   char **new_args;
   struct grub_arg_option *parser;
   struct grub_arg_list *state;
+  struct grub_extcmd_context context;
   int maxargs = 0;
   grub_err_t ret;
-  grub_extcmd_t ext;
+  grub_extcmd_t ext = cmd->data;
+
+  context.state = 0;
+  context.extcmd = ext;
+  context.script = script;
+
+  if (! ext->options)
+    {
+      ret = (ext->func) (&context, argc, args);
+      return ret;
+    }
 
-  ext = cmd->data;
   parser = (struct grub_arg_option *) ext->options;
   while (parser && (parser++)->doc)
     maxargs++;
@@ -44,8 +55,8 @@ grub_extcmd_dispatcher (struct grub_command *cmd,
 
   if (grub_arg_parse (ext, argc, args, state, &new_args, &new_argc))
     {
-      ext->state = state;
-      ret = (ext->func) (ext, new_argc, new_args);
+      context.state = state;
+      ret = (ext->func) (&context, new_argc, new_args);
       grub_free (new_args);
     }
   else
@@ -56,11 +67,18 @@ grub_extcmd_dispatcher (struct grub_command *cmd,
   return ret;
 }
 
+static grub_err_t
+grub_extcmd_dispatch (struct grub_command *cmd, int argc, char **args)
+{
+  return grub_extcmd_dispatcher (cmd, argc, args, 0);
+}
+
 grub_extcmd_t
-grub_register_extcmd (const char *name, grub_extcmd_func_t func,
-		      unsigned flags, const char *summary,
-		      const char *description,
-		      const struct grub_arg_option *parser)
+grub_register_extcmd_prio (const char *name, grub_extcmd_func_t func,
+			   unsigned flags, const char *summary,
+			   const char *description,
+			   const struct grub_arg_option *parser,
+			   int prio)
 {
   grub_extcmd_t ext;
   grub_command_t cmd;
@@ -69,8 +87,8 @@ grub_register_extcmd (const char *name, grub_extcmd_func_t func,
   if (! ext)
     return 0;
 
-  cmd = grub_register_command_prio (name, grub_extcmd_dispatcher,
-				    summary, description, 1);
+  cmd = grub_register_command_prio (name, grub_extcmd_dispatch,
+				    summary, description, prio);
   if (! cmd)
     {
       grub_free (ext);
@@ -88,6 +106,16 @@ grub_register_extcmd (const char *name, grub_extcmd_func_t func,
   return ext;
 }
 
+grub_extcmd_t
+grub_register_extcmd (const char *name, grub_extcmd_func_t func,
+		      unsigned flags, const char *summary,
+		      const char *description,
+		      const struct grub_arg_option *parser)
+{
+  return grub_register_extcmd_prio (name, func, flags,
+				    summary, description, parser, 1);
+}
+
 void
 grub_unregister_extcmd (grub_extcmd_t ext)
 {
diff --git a/grub-core/commands/hashsum.c b/grub-core/commands/hashsum.c
index d5f551dbb..df85015a6 100644
--- a/grub-core/commands/hashsum.c
+++ b/grub-core/commands/hashsum.c
@@ -165,10 +165,10 @@ check_list (const gcry_md_spec_t *hash, const char *hashfilename,
 }
 
 static grub_err_t
-grub_cmd_hashsum (struct grub_extcmd *cmd,
+grub_cmd_hashsum (struct grub_extcmd_context *ctxt,
 		  int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   const char *hashname = NULL;
   const char *prefix = NULL;
   const gcry_md_spec_t *hash;
@@ -177,7 +177,7 @@ grub_cmd_hashsum (struct grub_extcmd *cmd,
   unsigned unread = 0;
 
   for (i = 0; i < ARRAY_SIZE (aliases); i++)
-    if (grub_strcmp (cmd->cmd->name, aliases[i].name) == 0)
+    if (grub_strcmp (ctxt->extcmd->cmd->name, aliases[i].name) == 0)
       hashname = aliases[i].hashname;
   if (state[0].set)
     hashname = state[0].arg;
diff --git a/grub-core/commands/hdparm.c b/grub-core/commands/hdparm.c
index a3f8bbff0..54724077d 100644
--- a/grub-core/commands/hdparm.c
+++ b/grub-core/commands/hdparm.c
@@ -270,9 +270,9 @@ static int get_int_arg (const struct grub_arg_list *state)
 }
 
 static grub_err_t
-grub_cmd_hdparm (grub_extcmd_t cmd, int argc, char **args) // state????
+grub_cmd_hdparm (grub_extcmd_context_t ctxt, int argc, char **args) // state????
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
 
   /* Check command line.  */
   if (argc != 1)
diff --git a/grub-core/commands/help.c b/grub-core/commands/help.c
index e7d108c33..1ca46aa7e 100644
--- a/grub-core/commands/help.c
+++ b/grub-core/commands/help.c
@@ -27,7 +27,7 @@
 #include <grub/charset.h>
 
 static grub_err_t
-grub_cmd_help (grub_extcmd_t ext __attribute__ ((unused)), int argc,
+grub_cmd_help (grub_extcmd_context_t ctxt __attribute__ ((unused)), int argc,
 	       char **args)
 {
   int cnt = 0;
@@ -112,7 +112,8 @@ grub_cmd_help (grub_extcmd_t ext __attribute__ ((unused)), int argc,
 		    if (cnt++ > 0)
 		      grub_printf ("\n\n");
 
-		    if (cmd->flags & GRUB_COMMAND_FLAG_EXTCMD)
+		    if ((cmd->flags & GRUB_COMMAND_FLAG_EXTCMD) &&
+			! (cmd->flags & GRUB_COMMAND_FLAG_DYNCMD))
 		      grub_arg_show_help ((grub_extcmd_t) cmd->data);
 		    else
 		      grub_printf ("%s %s %s\n%s\n", _("Usage:"), cmd->name, _(cmd->summary),
diff --git a/grub-core/commands/hexdump.c b/grub-core/commands/hexdump.c
index c1d4ecba9..6c518f649 100644
--- a/grub-core/commands/hexdump.c
+++ b/grub-core/commands/hexdump.c
@@ -34,9 +34,9 @@ static const struct grub_arg_option options[] = {
 };
 
 static grub_err_t
-grub_cmd_hexdump (grub_extcmd_t cmd, int argc, char **args)
+grub_cmd_hexdump (grub_extcmd_context_t ctxt, int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   char buf[GRUB_DISK_SECTOR_SIZE * 4];
   grub_ssize_t size, length;
   grub_disk_addr_t skip;
diff --git a/grub-core/commands/i386/cpuid.c b/grub-core/commands/i386/cpuid.c
index 6eebf91a1..412b284d0 100644
--- a/grub-core/commands/i386/cpuid.c
+++ b/grub-core/commands/i386/cpuid.c
@@ -43,7 +43,7 @@ static const struct grub_arg_option options[] =
 unsigned char grub_cpuid_has_longmode = 0;
 
 static grub_err_t
-grub_cmd_cpuid (grub_extcmd_t cmd __attribute__ ((unused)),
+grub_cmd_cpuid (grub_extcmd_context_t ctxt __attribute__ ((unused)),
 		int argc __attribute__ ((unused)),
 		char **args __attribute__ ((unused)))
 {
diff --git a/grub-core/commands/i386/pc/drivemap.c b/grub-core/commands/i386/pc/drivemap.c
index 4afc43358..7ecfe7454 100644
--- a/grub-core/commands/i386/pc/drivemap.c
+++ b/grub-core/commands/i386/pc/drivemap.c
@@ -196,13 +196,13 @@ list_mappings (void)
 }
 
 static grub_err_t
-grub_cmd_drivemap (struct grub_extcmd *cmd, int argc, char **args)
+grub_cmd_drivemap (struct grub_extcmd_context *ctxt, int argc, char **args)
 {
-  if (cmd->state[OPTIDX_LIST].set)
+  if (ctxt->state[OPTIDX_LIST].set)
     {
       return list_mappings ();
     }
-  else if (cmd->state[OPTIDX_RESET].set)
+  else if (ctxt->state[OPTIDX_RESET].set)
     {
       /* Reset: just delete all mappings, freeing their memory.  */
       drivemap_node_t *curnode = map_head;
@@ -216,7 +216,7 @@ grub_cmd_drivemap (struct grub_extcmd *cmd, int argc, char **args)
       map_head = 0;
       return GRUB_ERR_NONE;
     }
-  else if (!cmd->state[OPTIDX_SWAP].set && argc == 0)
+  else if (!ctxt->state[OPTIDX_SWAP].set && argc == 0)
     {
       /* No arguments */
       return list_mappings ();
@@ -248,11 +248,11 @@ grub_cmd_drivemap (struct grub_extcmd *cmd, int argc, char **args)
     }
   /* Set the mapping for the disk (overwrites any existing mapping).  */
   grub_dprintf ("drivemap", "%s %s (%02x) = %s (%02x)\n",
-		cmd->state[OPTIDX_SWAP].set ? "Swapping" : "Mapping",
+		ctxt->state[OPTIDX_SWAP].set ? "Swapping" : "Mapping",
 		args[1], mapto, args[0], mapfrom);
   err = drivemap_set (mapto, mapfrom);
   /* If -s, perform the reverse mapping too (only if the first was OK).  */
-  if (cmd->state[OPTIDX_SWAP].set && err == GRUB_ERR_NONE)
+  if (ctxt->state[OPTIDX_SWAP].set && err == GRUB_ERR_NONE)
     err = drivemap_set (mapfrom, mapto);
   return err;
 }
diff --git a/grub-core/commands/i386/pc/halt.c b/grub-core/commands/i386/pc/halt.c
index c237fe361..1e0aefa50 100644
--- a/grub-core/commands/i386/pc/halt.c
+++ b/grub-core/commands/i386/pc/halt.c
@@ -93,12 +93,12 @@ grub_halt (int no_apm)
 }
 
 static grub_err_t
-grub_cmd_halt (grub_extcmd_t cmd,
+grub_cmd_halt (grub_extcmd_context_t ctxt,
 	       int argc __attribute__ ((unused)),
 	       char **args __attribute__ ((unused)))
 
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   int no_apm = 0;
   if (state[0].set)
     no_apm = 1;
diff --git a/grub-core/commands/i386/pc/sendkey.c b/grub-core/commands/i386/pc/sendkey.c
index 6c5602dec..1f506b3cd 100644
--- a/grub-core/commands/i386/pc/sendkey.c
+++ b/grub-core/commands/i386/pc/sendkey.c
@@ -284,9 +284,9 @@ grub_sendkey_preboot (int noret __attribute__ ((unused)))
 }
 
 static grub_err_t
-grub_cmd_sendkey (grub_extcmd_t cmd, int argc, char **args)
+grub_cmd_sendkey (grub_extcmd_context_t ctxt, int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
 
   auto int find_key_code (char *key); 
   auto int find_ascii_code (char *key);
diff --git a/grub-core/commands/iorw.c b/grub-core/commands/iorw.c
index 474c8712e..bd0183794 100644
--- a/grub-core/commands/iorw.c
+++ b/grub-core/commands/iorw.c
@@ -36,7 +36,7 @@ static const struct grub_arg_option options[] =
 
 
 static grub_err_t
-grub_cmd_read (grub_extcmd_t cmd, int argc, char **argv)
+grub_cmd_read (grub_extcmd_context_t ctxt, int argc, char **argv)
 {
   grub_target_addr_t addr;
   grub_uint32_t value = 0;
@@ -46,7 +46,7 @@ grub_cmd_read (grub_extcmd_t cmd, int argc, char **argv)
     return grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid number of arguments");
 
   addr = grub_strtoul (argv[0], 0, 0);
-  switch (cmd->cmd->name[sizeof ("in") - 1])
+  switch (ctxt->extcmd->cmd->name[sizeof ("in") - 1])
     {
     case 'l':
       value = grub_inl (addr);
@@ -61,10 +61,10 @@ grub_cmd_read (grub_extcmd_t cmd, int argc, char **argv)
       break;
     }
 
-  if (cmd->state[0].set)
+  if (ctxt->state[0].set)
     {
       grub_snprintf (buf, sizeof (buf), "%x", value);
-      grub_env_set (cmd->state[0].arg, buf);
+      grub_env_set (ctxt->state[0].arg, buf);
     }
   else
     grub_printf ("0x%x\n", value);
diff --git a/grub-core/commands/keystatus.c b/grub-core/commands/keystatus.c
index 838792889..c83c00560 100644
--- a/grub-core/commands/keystatus.c
+++ b/grub-core/commands/keystatus.c
@@ -34,11 +34,11 @@ static const struct grub_arg_option options[] =
 #define grub_cur_term_input	grub_term_get_current_input ()
 
 static grub_err_t
-grub_cmd_keystatus (grub_extcmd_t cmd,
+grub_cmd_keystatus (grub_extcmd_context_t ctxt,
 		    int argc __attribute__ ((unused)),
 		    char **args __attribute__ ((unused)))
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   int expect_mods = 0;
   int mods;
 
diff --git a/grub-core/commands/loadenv.c b/grub-core/commands/loadenv.c
index d763b2d5e..381810a92 100644
--- a/grub-core/commands/loadenv.c
+++ b/grub-core/commands/loadenv.c
@@ -111,11 +111,11 @@ read_envblk_file (grub_file_t file)
 }
 
 static grub_err_t
-grub_cmd_load_env (grub_extcmd_t cmd,
+grub_cmd_load_env (grub_extcmd_context_t ctxt,
 		   int argc __attribute__ ((unused)),
 		   char **args __attribute__ ((unused)))
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   grub_file_t file;
   grub_envblk_t envblk;
 
@@ -143,11 +143,11 @@ grub_cmd_load_env (grub_extcmd_t cmd,
 }
 
 static grub_err_t
-grub_cmd_list_env (grub_extcmd_t cmd,
+grub_cmd_list_env (grub_extcmd_context_t ctxt,
 		   int argc __attribute__ ((unused)),
 		   char **args __attribute__ ((unused)))
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   grub_file_t file;
   grub_envblk_t envblk;
 
@@ -280,9 +280,9 @@ write_blocklists (grub_envblk_t envblk, struct blocklist *blocklists,
 }
 
 static grub_err_t
-grub_cmd_save_env (grub_extcmd_t cmd, int argc, char **args)
+grub_cmd_save_env (grub_extcmd_context_t ctxt, int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   grub_file_t file;
   grub_envblk_t envblk;
   struct blocklist *head = 0;
diff --git a/grub-core/commands/ls.c b/grub-core/commands/ls.c
index 9ee0a7a31..b91ef2942 100644
--- a/grub-core/commands/ls.c
+++ b/grub-core/commands/ls.c
@@ -248,9 +248,9 @@ grub_ls_list_files (char *dirname, int longlist, int all, int human)
 }
 
 static grub_err_t
-grub_cmd_ls (grub_extcmd_t cmd, int argc, char **args)
+grub_cmd_ls (grub_extcmd_context_t ctxt, int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
 
   if (argc == 0)
     grub_ls_list_devices (state[0].set);
diff --git a/grub-core/commands/lspci.c b/grub-core/commands/lspci.c
index a69bb35ad..bc52e060a 100644
--- a/grub-core/commands/lspci.c
+++ b/grub-core/commands/lspci.c
@@ -211,11 +211,11 @@ grub_lspci_iter (grub_pci_device_t dev, grub_pci_id_t pciid)
 }
 
 static grub_err_t
-grub_cmd_lspci (grub_extcmd_t cmd,
+grub_cmd_lspci (grub_extcmd_context_t ctxt,
 		int argc __attribute__ ((unused)),
 		char **args __attribute__ ((unused)))
 {
-  iospace = cmd->state[0].set;
+  iospace = ctxt->state[0].set;
   grub_pci_iterate (grub_lspci_iter);
   return GRUB_ERR_NONE;
 }
diff --git a/grub-core/commands/memrw.c b/grub-core/commands/memrw.c
index 6a4d43be2..d28f45ec1 100644
--- a/grub-core/commands/memrw.c
+++ b/grub-core/commands/memrw.c
@@ -35,7 +35,7 @@ static const struct grub_arg_option options[] =
 
 
 static grub_err_t
-grub_cmd_read (grub_extcmd_t cmd, int argc, char **argv)
+grub_cmd_read (grub_extcmd_context_t ctxt, int argc, char **argv)
 {
   grub_target_addr_t addr;
   grub_uint32_t value = 0;
@@ -45,7 +45,7 @@ grub_cmd_read (grub_extcmd_t cmd, int argc, char **argv)
     return grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid number of arguments");
 
   addr = grub_strtoul (argv[0], 0, 0);
-  switch (cmd->cmd->name[sizeof ("read_") - 1])
+  switch (ctxt->extcmd->cmd->name[sizeof ("read_") - 1])
     {
     case 'd':
       value = *((volatile grub_uint32_t *) addr);
@@ -60,10 +60,10 @@ grub_cmd_read (grub_extcmd_t cmd, int argc, char **argv)
       break;
     }
 
-  if (cmd->state[0].set)
+  if (ctxt->state[0].set)
     {
       grub_snprintf (buf, sizeof (buf), "%x", value);
-      grub_env_set (cmd->state[0].arg, buf);
+      grub_env_set (ctxt->state[0].arg, buf);
     }
   else
     grub_printf ("0x%x\n", value);
diff --git a/grub-core/commands/probe.c b/grub-core/commands/probe.c
index c2cc599e9..f3941e029 100644
--- a/grub-core/commands/probe.c
+++ b/grub-core/commands/probe.c
@@ -45,9 +45,9 @@ static const struct grub_arg_option options[] =
   };
 
 static grub_err_t
-grub_cmd_probe (grub_extcmd_t cmd, int argc, char **args)
+grub_cmd_probe (grub_extcmd_context_t ctxt, int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   grub_device_t dev;
   grub_fs_t fs;
   char *ptr;
diff --git a/grub-core/commands/search_wrap.c b/grub-core/commands/search_wrap.c
index 2891d85d7..fff3fb47a 100644
--- a/grub-core/commands/search_wrap.c
+++ b/grub-core/commands/search_wrap.c
@@ -50,9 +50,9 @@ enum options
  };
 
 static grub_err_t
-grub_cmd_search (grub_extcmd_t cmd, int argc, char **args)
+grub_cmd_search (grub_extcmd_context_t ctxt, int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   const char *var = 0;
 
   if (argc == 0)
diff --git a/grub-core/commands/setpci.c b/grub-core/commands/setpci.c
index aa09f5bbb..5e947cd7d 100644
--- a/grub-core/commands/setpci.c
+++ b/grub-core/commands/setpci.c
@@ -155,7 +155,7 @@ grub_setpci_iter (grub_pci_device_t dev, grub_pci_id_t pciid)
 }
 
 static grub_err_t
-grub_cmd_setpci (grub_extcmd_t cmd, int argc, char **argv)
+grub_cmd_setpci (grub_extcmd_context_t ctxt, int argc, char **argv)
 {
   const char *ptr;
   unsigned i;
@@ -163,14 +163,14 @@ grub_cmd_setpci (grub_extcmd_t cmd, int argc, char **argv)
   pciid_check_value = 0;
   pciid_check_mask = 0;
 
-  if (cmd->state[0].set)
+  if (ctxt->state[0].set)
     {
-      ptr = cmd->state[0].arg;
+      ptr = ctxt->state[0].arg;
       pciid_check_value |= (grub_strtoul (ptr, (char **) &ptr, 16) & 0xffff);
       if (grub_errno == GRUB_ERR_BAD_NUMBER)
 	{
 	  grub_errno = GRUB_ERR_NONE;
-	  ptr = cmd->state[0].arg;
+	  ptr = ctxt->state[0].arg;
 	}
       else
 	pciid_check_mask |= 0xffff;
@@ -191,11 +191,11 @@ grub_cmd_setpci (grub_extcmd_t cmd, int argc, char **argv)
 
   check_bus = check_device = check_function = 0;
 
-  if (cmd->state[1].set)
+  if (ctxt->state[1].set)
     {
       const char *optr;
       
-      ptr = cmd->state[1].arg;
+      ptr = ctxt->state[1].arg;
       optr = ptr;
       bus = grub_strtoul (ptr, (char **) &ptr, 16);
       if (grub_errno == GRUB_ERR_BAD_NUMBER)
@@ -229,8 +229,8 @@ grub_cmd_setpci (grub_extcmd_t cmd, int argc, char **argv)
 	}
     }
 
-  if (cmd->state[2].set)
-    varname = cmd->state[2].arg;
+  if (ctxt->state[2].set)
+    varname = ctxt->state[2].arg;
   else
     varname = NULL;
 
diff --git a/grub-core/commands/sleep.c b/grub-core/commands/sleep.c
index ead279506..ee0875cf7 100644
--- a/grub-core/commands/sleep.c
+++ b/grub-core/commands/sleep.c
@@ -60,9 +60,9 @@ grub_interruptible_millisleep (grub_uint32_t ms)
 }
 
 static grub_err_t
-grub_cmd_sleep (grub_extcmd_t cmd, int argc, char **args)
+grub_cmd_sleep (grub_extcmd_context_t ctxt, int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   int n;
 
   if (argc != 1)
diff --git a/grub-core/disk/loopback.c b/grub-core/disk/loopback.c
index 509e9e33f..8153478ed 100644
--- a/grub-core/disk/loopback.c
+++ b/grub-core/disk/loopback.c
@@ -71,9 +71,9 @@ delete_loopback (const char *name)
 
 /* The command to add and remove loopback devices.  */
 static grub_err_t
-grub_cmd_loopback (grub_extcmd_t cmd, int argc, char **args)
+grub_cmd_loopback (grub_extcmd_context_t ctxt, int argc, char **args)
 {
-  struct grub_arg_list *state = state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   grub_file_t file;
   struct grub_loopback *newdev;
   grub_err_t ret;
diff --git a/grub-core/hello/hello.c b/grub-core/hello/hello.c
index eff07d941..183ee7798 100644
--- a/grub-core/hello/hello.c
+++ b/grub-core/hello/hello.c
@@ -27,7 +27,7 @@
 #include <grub/i18n.h>
 
 static grub_err_t
-grub_cmd_hello (struct grub_extcmd *cmd __attribute__ ((unused)),
+grub_cmd_hello (grub_extcmd_context_t ctxt __attribute__ ((unused)),
 		int argc __attribute__ ((unused)),
 		char **args __attribute__ ((unused)))
 {
diff --git a/grub-core/loader/i386/bsd.c b/grub-core/loader/i386/bsd.c
index d72c8195a..84459b15b 100644
--- a/grub-core/loader/i386/bsd.c
+++ b/grub-core/loader/i386/bsd.c
@@ -1372,10 +1372,10 @@ grub_bsd_parse_flags (const struct grub_arg_list *state,
 }
 
 static grub_err_t
-grub_cmd_freebsd (grub_extcmd_t cmd, int argc, char *argv[])
+grub_cmd_freebsd (grub_extcmd_context_t ctxt, int argc, char *argv[])
 {
   kernel_type = KERNEL_TYPE_FREEBSD;
-  bootflags = grub_bsd_parse_flags (cmd->state, freebsd_flags);
+  bootflags = grub_bsd_parse_flags (ctxt->state, freebsd_flags);
 
   if (grub_bsd_load (argc, argv) == GRUB_ERR_NONE)
     {
@@ -1429,16 +1429,16 @@ grub_cmd_freebsd (grub_extcmd_t cmd, int argc, char *argv[])
 }
 
 static grub_err_t
-grub_cmd_openbsd (grub_extcmd_t cmd, int argc, char *argv[])
+grub_cmd_openbsd (grub_extcmd_context_t ctxt, int argc, char *argv[])
 {
   grub_uint32_t bootdev;
 
   kernel_type = KERNEL_TYPE_OPENBSD;
-  bootflags = grub_bsd_parse_flags (cmd->state, openbsd_flags);
+  bootflags = grub_bsd_parse_flags (ctxt->state, openbsd_flags);
 
-  if (cmd->state[OPENBSD_ROOT_ARG].set)
+  if (ctxt->state[OPENBSD_ROOT_ARG].set)
     {
-      const char *arg = cmd->state[OPENBSD_ROOT_ARG].arg;
+      const char *arg = ctxt->state[OPENBSD_ROOT_ARG].arg;
       int unit, part;
       if (*(arg++) != 'w' || *(arg++) != 'd')
 	return grub_error (GRUB_ERR_BAD_ARGUMENT,
@@ -1459,7 +1459,7 @@ grub_cmd_openbsd (grub_extcmd_t cmd, int argc, char *argv[])
   else
     bootdev = 0;
 
-  if (cmd->state[OPENBSD_SERIAL_ARG].set)
+  if (ctxt->state[OPENBSD_SERIAL_ARG].set)
     {
       struct grub_openbsd_bootarg_console serial;
       char *ptr;
@@ -1468,9 +1468,9 @@ grub_cmd_openbsd (grub_extcmd_t cmd, int argc, char *argv[])
 
       grub_memset (&serial, 0, sizeof (serial));
 
-      if (cmd->state[OPENBSD_SERIAL_ARG].arg)
+      if (ctxt->state[OPENBSD_SERIAL_ARG].arg)
 	{
-	  ptr = cmd->state[OPENBSD_SERIAL_ARG].arg;
+	  ptr = ctxt->state[OPENBSD_SERIAL_ARG].arg;
 	  if (grub_memcmp (ptr, "com", sizeof ("com") - 1) != 0)
 	    return grub_error (GRUB_ERR_BAD_ARGUMENT,
 			       "only com0-com3 are supported");
@@ -1514,11 +1514,11 @@ grub_cmd_openbsd (grub_extcmd_t cmd, int argc, char *argv[])
 }
 
 static grub_err_t
-grub_cmd_netbsd (grub_extcmd_t cmd, int argc, char *argv[])
+grub_cmd_netbsd (grub_extcmd_context_t ctxt, int argc, char *argv[])
 {
   grub_err_t err;
   kernel_type = KERNEL_TYPE_NETBSD;
-  bootflags = grub_bsd_parse_flags (cmd->state, netbsd_flags);
+  bootflags = grub_bsd_parse_flags (ctxt->state, netbsd_flags);
 
   if (grub_bsd_load (argc, argv) == GRUB_ERR_NONE)
     {
@@ -1551,15 +1551,15 @@ grub_cmd_netbsd (grub_extcmd_t cmd, int argc, char *argv[])
 	grub_bsd_add_meta (NETBSD_BTINFO_BOOTPATH, bootpath, sizeof (bootpath));
       }
 
-      if (cmd->state[NETBSD_ROOT_ARG].set)
+      if (ctxt->state[NETBSD_ROOT_ARG].set)
 	{
 	  char root[GRUB_NETBSD_MAX_ROOTDEVICE_LEN];
 	  grub_memset (root, 0, sizeof (root));
-	  grub_strncpy (root, cmd->state[NETBSD_ROOT_ARG].arg,
+	  grub_strncpy (root, ctxt->state[NETBSD_ROOT_ARG].arg,
 			sizeof (root) - 1);
 	  grub_bsd_add_meta (NETBSD_BTINFO_ROOTDEVICE, root, sizeof (root));
 	}
-      if (cmd->state[NETBSD_SERIAL_ARG].set)
+      if (ctxt->state[NETBSD_SERIAL_ARG].set)
 	{
 	  struct grub_netbsd_btinfo_serial serial;
 	  char *ptr;
@@ -1567,9 +1567,9 @@ grub_cmd_netbsd (grub_extcmd_t cmd, int argc, char *argv[])
 	  grub_memset (&serial, 0, sizeof (serial));
 	  grub_strcpy (serial.devname, "com");
 
-	  if (cmd->state[NETBSD_SERIAL_ARG].arg)
+	  if (ctxt->state[NETBSD_SERIAL_ARG].arg)
 	    {
-	      ptr = cmd->state[NETBSD_SERIAL_ARG].arg;
+	      ptr = ctxt->state[NETBSD_SERIAL_ARG].arg;
 	      if (grub_memcmp (ptr, "com", sizeof ("com") - 1) == 0)
 		{
 		  ptr += sizeof ("com") - 1;
diff --git a/grub-core/loader/xnu.c b/grub-core/loader/xnu.c
index 17f850018..92532ed35 100644
--- a/grub-core/loader/xnu.c
+++ b/grub-core/loader/xnu.c
@@ -1364,15 +1364,15 @@ static const struct grub_arg_option xnu_splash_cmd_options[] =
   };
 
 static grub_err_t
-grub_cmd_xnu_splash (grub_extcmd_t cmd,
+grub_cmd_xnu_splash (grub_extcmd_context_t ctxt,
 		     int argc, char *args[])
 {
   grub_err_t err;
   if (argc != 1)
     return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required");
 
-  if (cmd->state[XNU_SPLASH_CMD_ARGINDEX_MODE].set &&
-      grub_strcmp (cmd->state[XNU_SPLASH_CMD_ARGINDEX_MODE].arg,
+  if (ctxt->state[XNU_SPLASH_CMD_ARGINDEX_MODE].set &&
+      grub_strcmp (ctxt->state[XNU_SPLASH_CMD_ARGINDEX_MODE].arg,
 		   "stretch") == 0)
     grub_xnu_bitmap_mode = GRUB_XNU_BITMAP_STRETCH;
   else
diff --git a/grub-core/normal/dyncmd.c b/grub-core/normal/dyncmd.c
index a3cafa514..3519253f6 100644
--- a/grub-core/normal/dyncmd.c
+++ b/grub-core/normal/dyncmd.c
@@ -23,16 +23,21 @@
 #include <grub/misc.h>
 #include <grub/command.h>
 #include <grub/normal.h>
+#include <grub/extcmd.h>
+#include <grub/script_sh.h>
 #include <grub/i18n.h>
 
 static grub_err_t
-grub_dyncmd_dispatcher (struct grub_command *cmd,
+grub_dyncmd_dispatcher (struct grub_extcmd_context *ctxt,
 			int argc, char **args)
 {
-  char *modname = cmd->data;
+  char *modname;
   grub_dl_t mod;
   grub_err_t ret;
+  grub_extcmd_t extcmd = ctxt->extcmd;
+  grub_command_t cmd = extcmd->cmd;
 
+  modname = extcmd->data;
   mod = grub_dl_load (modname);
   if (mod)
     {
@@ -42,11 +47,17 @@ grub_dyncmd_dispatcher (struct grub_command *cmd,
       grub_dl_ref (mod);
 
       name = (char *) cmd->name;
-      grub_unregister_command (cmd);
+      grub_unregister_extcmd (extcmd);
 
       cmd = grub_command_find (name);
       if (cmd)
-	ret = (cmd->func) (cmd, argc, args);
+	{
+	  if (cmd->flags & GRUB_COMMAND_FLAG_BLOCKS &&
+	      cmd->flags & GRUB_COMMAND_FLAG_EXTCMD)
+	    ret = grub_extcmd_dispatcher (cmd, argc, args, ctxt->script);
+	  else
+	    ret = (cmd->func) (cmd, argc, args);
+	}
       else
 	ret = grub_errno;
 
@@ -81,13 +92,14 @@ read_command_list (const char *prefix)
 	      for (ptr = grub_command_list; ptr; ptr = next)
 		{
 		  next = ptr->next;
-		  if (ptr->func == grub_dyncmd_dispatcher)
+		  if (ptr->flags & GRUB_COMMAND_FLAG_DYNCMD)
 		    {
 		      if (last)
 			last->next = ptr->next;
 		      else
 			grub_command_list = ptr->next;
 		      grub_free (ptr);
+		      grub_free (ptr->data); /* extcmd struct */
 		    }
 		  else
 		    last = ptr;
@@ -96,7 +108,7 @@ read_command_list (const char *prefix)
 	      for (;; grub_free (buf))
 		{
 		  char *p, *name, *modname;
-		  grub_command_t cmd;
+		  grub_extcmd_t cmd;
 		  int prio = 0;
 
 		  buf = grub_file_getline (file);
@@ -139,16 +151,20 @@ read_command_list (const char *prefix)
 		      continue;
 		    }
 
-		  cmd = grub_register_command_prio (name,
-						    grub_dyncmd_dispatcher,
-						    0, N_("not loaded"), prio);
+		  cmd = grub_register_extcmd_prio (name,
+						   grub_dyncmd_dispatcher,
+						   GRUB_COMMAND_FLAG_BLOCKS
+						   | GRUB_COMMAND_FLAG_EXTCMD
+						   | GRUB_COMMAND_FLAG_CMDLINE
+						   | GRUB_COMMAND_FLAG_DYNCMD,
+						   0, N_("not loaded"), 0,
+						   prio);
 		  if (! cmd)
 		    {
 		      grub_free (name);
 		      grub_free (modname);
 		      continue;
 		    }
-		  cmd->flags |= GRUB_COMMAND_FLAG_DYNCMD;
 		  cmd->data = modname;
 
 		  /* Update the active flag.  */
diff --git a/grub-core/script/argv.c b/grub-core/script/argv.c
index b69ee39c5..92449138b 100644
--- a/grub-core/script/argv.c
+++ b/grub-core/script/argv.c
@@ -18,6 +18,7 @@
  */
 
 #include <grub/mm.h>
+#include <grub/misc.h>
 #include <grub/script_sh.h>
 
 /* Return nearest power of two that is >= v.  */
@@ -55,6 +56,7 @@ grub_script_argv_free (struct grub_script_argv *argv)
 
   argv->argc = 0;
   argv->args = 0;
+  argv->script = 0;
 }
 
 /* Prepare for next argc.  */
@@ -63,7 +65,7 @@ grub_script_argv_next (struct grub_script_argv *argv)
 {
   char **p = argv->args;
 
-  if (argv->args && argv->args[argv->argc - 1] == 0)
+  if (argv->args && argv->argc && argv->args[argv->argc - 1] == 0)
     return 0;
 
   p = grub_realloc (p, round_up_exp ((argv->argc + 2) * sizeof (char *)));
diff --git a/grub-core/script/execute.c b/grub-core/script/execute.c
index 26a46b12b..743b315eb 100644
--- a/grub-core/script/execute.c
+++ b/grub-core/script/execute.c
@@ -25,6 +25,7 @@
 #include <grub/menu.h>
 #include <grub/lib/arg.h>
 #include <grub/normal.h>
+#include <grub/extcmd.h>
 
 /* Max digits for a char is 3 (0xFF is 255), similarly for an int it
    is sizeof (int) * 3, and one extra for a possible -ve sign.  */
@@ -104,7 +105,7 @@ grub_env_special (const char *name)
 static char **
 grub_script_env_get (const char *name, grub_script_arg_type_t type)
 {
-  struct grub_script_argv result = { 0, 0 };
+  struct grub_script_argv result = { 0, 0, 0 };
 
   if (grub_script_argv_next (&result))
     goto fail;
@@ -222,7 +223,7 @@ grub_script_arglist_to_argv (struct grub_script_arglist *arglist,
   int i;
   char **values = 0;
   struct grub_script_arg *arg = 0;
-  struct grub_script_argv result = { 0, 0 };
+  struct grub_script_argv result = { 0, 0, 0 };
 
   for (; arglist && arglist->arg; arglist = arglist->next)
     {
@@ -248,6 +249,14 @@ grub_script_arglist_to_argv (struct grub_script_arglist *arglist,
 	      grub_free (values);
 	      break;
 
+	    case GRUB_SCRIPT_ARG_TYPE_BLOCK:
+	      if (grub_script_argv_append (&result, "{") ||
+		  grub_script_argv_append (&result, arg->str) ||
+		  grub_script_argv_append (&result, "}"))
+		goto fail;
+	      result.script = arg->script;
+	      break;
+
 	    case GRUB_SCRIPT_ARG_TYPE_TEXT:
 	      if (grub_strlen (arg->str) &&
 		  grub_script_argv_append (&result, arg->str))
@@ -325,7 +334,7 @@ grub_script_execute_cmdline (struct grub_script_cmd *cmd)
   grub_script_function_t func = 0;
   char errnobuf[18];
   char *cmdname;
-  struct grub_script_argv argv = { 0, 0 };
+  struct grub_script_argv argv = { 0, 0, 0 };
 
   /* Lookup the command.  */
   if (grub_script_arglist_to_argv (cmdline->arglist, &argv) || ! argv.args[0])
@@ -369,7 +378,14 @@ grub_script_execute_cmdline (struct grub_script_cmd *cmd)
 
   /* Execute the GRUB command or function.  */
   if (grubcmd)
-    ret = (grubcmd->func) (grubcmd, argv.argc - 1, argv.args + 1);
+    {
+      if ((grubcmd->flags & GRUB_COMMAND_FLAG_BLOCKS) &&
+	  (grubcmd->flags & GRUB_COMMAND_FLAG_EXTCMD))
+	ret = grub_extcmd_dispatcher (grubcmd, argv.argc - 1, argv.args + 1,
+				      argv.script);
+      else
+	ret = (grubcmd->func) (grubcmd, argv.argc - 1, argv.args + 1);
+    }
   else
     ret = grub_script_function_call (func, argv.argc - 1, argv.args + 1);
 
@@ -429,8 +445,7 @@ grub_script_execute_cmdfor (struct grub_script_cmd *cmd)
 {
   unsigned i;
   grub_err_t result;
-  struct grub_script_argv argv = { 0, 0 };
-
+  struct grub_script_argv argv = { 0, 0, 0 };
   struct grub_script_cmdfor *cmdfor = (struct grub_script_cmdfor *) cmd;
 
   if (grub_script_arglist_to_argv (cmdfor->words, &argv))
@@ -495,7 +510,7 @@ grub_err_t
 grub_script_execute_menuentry (struct grub_script_cmd *cmd)
 {
   struct grub_script_cmd_menuentry *cmd_menuentry;
-  struct grub_script_argv argv = { 0, 0 };
+  struct grub_script_argv argv = { 0, 0, 0 };
 
   cmd_menuentry = (struct grub_script_cmd_menuentry *) cmd;
 
diff --git a/grub-core/script/lexer.c b/grub-core/script/lexer.c
index 3c59e4499..3ab40049f 100644
--- a/grub-core/script/lexer.c
+++ b/grub-core/script/lexer.c
@@ -38,63 +38,54 @@ grub_script_lexer_deref (struct grub_lexer_param *state)
 }
 
 /* Start recording all characters passing through the lexer.  */
-void
+unsigned
 grub_script_lexer_record_start (struct grub_parser_param *parser)
 {
   struct grub_lexer_param *lexer = parser->lexerstate;
 
-  lexer->record = 1;
-  lexer->recordpos = 0;
-  if (lexer->recording) /* reuse last record */
-    return;
+  lexer->record++;
+  if (lexer->recording)
+    return lexer->recordpos;
 
+  lexer->recordpos = 0;
   lexer->recordlen = GRUB_LEXER_INITIAL_RECORD_SIZE;
   lexer->recording = grub_malloc (lexer->recordlen);
   if (!lexer->recording)
     {
       grub_script_yyerror (parser, 0);
-      lexer->record = 0;
       lexer->recordlen = 0;
     }
+  return lexer->recordpos;
 }
 
 char *
-grub_script_lexer_record_stop (struct grub_parser_param *parser)
+grub_script_lexer_record_stop (struct grub_parser_param *parser, unsigned offset)
 {
-  char *ptr;
+  int count;
   char *result;
   struct grub_lexer_param *lexer = parser->lexerstate;
 
-  auto char *compact (char *start, char *end);
-  char *compact (char *start, char *end)
-  {
-    /* Delete '{' and '}' characters and whitespaces.  */
-    while (*start && grub_isspace (*start)) start++;
-    if (*start == '{') start++;
-    while (*start && grub_isspace (*start)) start++;
-
-    while (*end && grub_isspace (*end)) end--;
-    if (*end == '}') end--;
-    while (*end && grub_isspace (*end)) end--;
-    end[1] = '\0';
-
-    return start;
-  }
-
-  if (!lexer->record || !lexer->recording)
+  if (!lexer->record)
     return 0;
 
-  /* XXX This is not necessary in BASH.  */
+  lexer->record--;
+  if (!lexer->recording)
+    return 0;
 
-  ptr = compact (lexer->recording, lexer->recording + lexer->recordpos - 1);
-  lexer->record = 0;
-  lexer->recordpos = 0;
-
-  /* This memory would be freed by, grub_script_free.  */
-  result = grub_script_malloc (parser, grub_strlen (ptr) + 1);
-  if (result)
-    grub_strcpy (result, ptr);
+  count = lexer->recordpos - offset;
+  result = grub_script_malloc (parser, count + 1);
+  if (result) {
+    grub_strncpy (result, lexer->recording + offset, count);
+    result[count] = '\0';
+  }
 
+  if (lexer->record == 0)
+    {
+      grub_free (lexer->recording);
+      lexer->recording = 0;
+      lexer->recordlen = 0;
+      lexer->recordpos = 0;
+    }
   return result;
 }
 
@@ -106,7 +97,7 @@ grub_script_lexer_record (struct grub_parser_param *parser, char *str)
   char *old;
   struct grub_lexer_param *lexer = parser->lexerstate;
 
-  if (!lexer->record)
+  if (!lexer->record || !lexer->recording)
     return;
 
   len = grub_strlen (str);
@@ -118,9 +109,8 @@ grub_script_lexer_record (struct grub_parser_param *parser, char *str)
       if (!lexer->recording)
 	{
 	  grub_free (old);
-	  lexer->record = 0;
 	  lexer->recordpos = 0;
-	  lexer->recordlen /= 2;
+	  lexer->recordlen = 0;
 	  grub_script_yyerror (parser, 0);
 	  return;
 	}
diff --git a/grub-core/script/main.c b/grub-core/script/main.c
index ff714d060..343bb50cd 100644
--- a/grub-core/script/main.c
+++ b/grub-core/script/main.c
@@ -35,7 +35,7 @@ grub_normal_parse_line (char *line, grub_reader_getline_t getline)
       grub_script_execute (parsed_script);
 
       /* The parsed script was executed, throw it away.  */
-      grub_script_free (parsed_script);
+      grub_script_unref (parsed_script);
     }
 
   return grub_errno;
diff --git a/grub-core/script/parser.y b/grub-core/script/parser.y
index 99cd2ee31..3faaf4736 100644
--- a/grub-core/script/parser.y
+++ b/grub-core/script/parser.y
@@ -20,6 +20,7 @@
 %{
 #include <grub/script_sh.h>
 #include <grub/mm.h>
+#include <grub/misc.h>
 
 #define YYFREE          grub_free
 #define YYMALLOC        grub_malloc
@@ -34,6 +35,11 @@
   struct grub_script_arglist *arglist;
   struct grub_script_arg *arg;
   char *string;
+  struct {
+    unsigned offset;
+    struct grub_script_mem *memory;
+    struct grub_script *scripts;
+  };
 }
 
 %token GRUB_PARSER_TOKEN_BAD
@@ -74,6 +80,7 @@
 %token <arg> GRUB_PARSER_TOKEN_NAME      "name"
 %token <arg> GRUB_PARSER_TOKEN_WORD      "word"
 
+%type <arg> block block0
 %type <arglist> word argument arguments0 arguments1
 
 %type <cmd> script_init script
@@ -146,6 +153,74 @@ argument : "case"      { $$ = grub_script_add_arglist (state, 0, $1); }
          | word { $$ = $1; }
 ;
 
+/*
+  Block parameter is passed to commands in two forms: as unparsed
+  string and as pre-parsed grub_script object.  Passing as grub_script
+  object makes memory management difficult, because:
+
+  (1) Command may want to keep a reference to grub_script objects for
+      later use, so script framework may not free the grub_script
+      object after command completes.
+
+  (2) Command may get called multiple times with same grub_script
+      object under loops, so we should not let command implementation
+      to free the grub_script object.
+
+  To solve above problems, we rely on reference counting for
+  grub_script objects.  Commands that want to keep the grub_script
+  object must take a reference to it.
+
+  Other complexity comes with arbitrary nesting of grub_script
+  objects: a grub_script object may have commands with several block
+  parameters, and each block parameter may further contain multiple
+  block parameters nested.  We use temporary variable, state->scripts
+  to collect nested child scripts (that are linked by siblings and
+  children members), and will build grub_scripts tree from bottom.
+ */
+block: "{"
+       {
+         grub_script_lexer_ref (state->lexerstate);
+         $<offset>$ = grub_script_lexer_record_start (state);
+	 $<memory>$ = grub_script_mem_record (state);
+
+	 /* save currently known scripts.  */
+	 $<scripts>$ = state->scripts;
+	 state->scripts = 0;
+       }
+       commands1 delimiters0 "}"
+       {
+         char *p;
+	 struct grub_script_mem *memory;
+	 struct grub_script *s = $<scripts>2;
+
+	 memory = grub_script_mem_record_stop (state, $<memory>2);
+         if ((p = grub_script_lexer_record_stop (state, $<offset>2)))
+	   *grub_strrchr (p, '}') = '\0';
+
+	 $$ = grub_script_arg_add (state, 0, GRUB_SCRIPT_ARG_TYPE_BLOCK, p);
+	 if (! $$ || ! ($$->script = grub_script_create ($3, memory)))
+	   grub_script_mem_free (memory);
+
+	 else {
+	   /* attach nested scripts to $$->script as children */
+	   $$->script->children = state->scripts;
+
+	   /* restore old scripts; append $$->script to siblings. */
+	   state->scripts = $<scripts>2 ?: $$->script;
+	   if (s) {
+	     while (s->next_siblings)
+	       s = s->next_siblings;
+	     s->next_siblings = $$->script;
+	   }
+	 }
+
+         grub_script_lexer_deref (state->lexerstate);
+       }
+;
+block0: /* Empty */ { $$ = 0; }
+      | block { $$ = $1; }
+;
+
 arguments0: /* Empty */ { $$ = 0; }
           | arguments1  { $$ = $1; }
 ;
@@ -161,13 +236,19 @@ arguments1: argument arguments0
             }
 ;
 
-grubcmd: word arguments0
+grubcmd: word arguments0 block0
          {
-           if ($1 && $2) {
-             $1->next = $2;
-             $1->argcount += $2->argcount;
-             $2->argcount = 0;
-           }
+	   struct grub_script_arglist *x = $2;
+
+	   if ($3)
+	     x = grub_script_add_arglist (state, $2, $3);
+
+           if ($1 && x)
+	     {
+	       $1->next = x;
+	       $1->argcount += x->argcount;
+	       x->argcount = 0;
+	     }
            $$ = grub_script_create_cmdline (state, $1);
          }
 ;
@@ -191,10 +272,13 @@ commands1: newlines0 command
            }
 ;
 
-function: "function" "name" 
+function: "function" "name"
           {
             grub_script_lexer_ref (state->lexerstate);
             state->func_mem = grub_script_mem_record (state);
+
+	    $<scripts>$ = state->scripts;
+	    state->scripts = 0;
           }
           delimiters0 "{" commands1 delimiters1 "}"
           {
@@ -202,9 +286,14 @@ function: "function" "name"
             state->func_mem = grub_script_mem_record_stop (state,
                                                            state->func_mem);
             script = grub_script_create ($6, state->func_mem);
-            if (script)
-              grub_script_function_create ($2, script);
+            if (! script)
+	      grub_script_mem_free (state->func_mem);
+	    else {
+	      script->children = state->scripts;
+	      grub_script_function_create ($2, script);
+	    }
 
+	    state->scripts = $<scripts>3;
             grub_script_lexer_deref (state->lexerstate);
           }
 ;
@@ -215,14 +304,16 @@ menuentry: "menuentry"
            }
            arguments1
            {
-             grub_script_lexer_record_start (state);
+             $<offset>$ = grub_script_lexer_record_start (state);
            }
            delimiters0 "{" commands1 delimiters1 "}"
            {
-             char *menu_entry;
-             menu_entry = grub_script_lexer_record_stop (state);
+             char *def;
+             def = grub_script_lexer_record_stop (state, $<offset>4);
+	     *grub_strrchr(def, '}') = '\0';
+
              grub_script_lexer_deref (state->lexerstate);
-             $$ = grub_script_create_cmdmenu (state, $3, menu_entry, 0);
+             $$ = grub_script_create_cmdmenu (state, $3, def, 0);
            }
 ;
 
diff --git a/grub-core/script/script.c b/grub-core/script/script.c
index 448bdf775..76d5aa518 100644
--- a/grub-core/script/script.c
+++ b/grub-core/script/script.c
@@ -54,7 +54,7 @@ grub_script_malloc (struct grub_parser_param *state, grub_size_t size)
 }
 
 /* Free all memory described by MEM.  */
-static void
+void
 grub_script_mem_free (struct grub_script_mem *mem)
 {
   struct grub_script_mem *memfree;
@@ -94,9 +94,21 @@ grub_script_mem_record_stop (struct grub_parser_param *state,
 void
 grub_script_free (struct grub_script *script)
 {
-  if (!script)
+  struct grub_script *s;
+  struct grub_script *t;
+
+  if (! script)
     return;
-  grub_script_mem_free (script->mem);
+
+  if (script->mem)
+    grub_script_mem_free (script->mem);
+
+  s = script->children;
+  while (s) {
+    t = s->next_siblings;
+    grub_script_unref (s);
+    s = t;
+  }
   grub_free (script);
 }
 
@@ -119,6 +131,8 @@ grub_script_arg_add (struct grub_parser_param *state,
     return arg;
 
   argpart->type = type;
+  argpart->script = 0;
+
   len = grub_strlen (str) + 1;
   argpart->str = grub_script_malloc (state, len);
   if (!argpart->str)
@@ -335,16 +349,14 @@ grub_script_create (struct grub_script_cmd *cmd, struct grub_script_mem *mem)
   struct grub_script *parsed;
 
   parsed = grub_malloc (sizeof (*parsed));
-  if (!parsed)
-    {
-      grub_script_mem_free (mem);
-      grub_free (cmd);
-
-      return 0;
-    }
+  if (! parsed)
+    return 0;
 
   parsed->mem = mem;
   parsed->cmd = cmd;
+  parsed->refcnt = 0;
+  parsed->children = 0;
+  parsed->next_siblings = 0;
 
   return parsed;
 }
@@ -359,7 +371,7 @@ grub_script_parse (char *script, grub_reader_getline_t getline)
   struct grub_lexer_param *lexstate;
   struct grub_parser_param *parsestate;
 
-  parsed = grub_malloc (sizeof (*parsed));
+  parsed = grub_script_create (0, 0);
   if (!parsed)
     return 0;
 
@@ -397,6 +409,7 @@ grub_script_parse (char *script, grub_reader_getline_t getline)
 
   parsed->mem = grub_script_mem_record_stop (parsestate, membackup);
   parsed->cmd = parsestate->parsed;
+  parsed->children = parsestate->scripts;
 
   grub_script_lexer_fini (lexstate);
   grub_free (parsestate);
diff --git a/grub-core/term/gfxterm.c b/grub-core/term/gfxterm.c
index 5f88f91ed..3616eb453 100644
--- a/grub-core/term/gfxterm.c
+++ b/grub-core/term/gfxterm.c
@@ -1113,11 +1113,10 @@ static const struct grub_arg_option background_image_cmd_options[] =
   };
 
 static grub_err_t
-grub_gfxterm_background_image_cmd (grub_extcmd_t cmd __attribute__ ((unused)),
-                                   int argc,
-                                   char **args)
+grub_gfxterm_background_image_cmd (grub_extcmd_context_t ctxt,
+                                   int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
 
   /* Check that we have video adapter active.  */
   if (grub_video_get_info(NULL) != GRUB_ERR_NONE)
diff --git a/grub-core/term/serial.c b/grub-core/term/serial.c
index 2268788af..394fc1576 100644
--- a/grub-core/term/serial.c
+++ b/grub-core/term/serial.c
@@ -150,9 +150,9 @@ grub_serial_find (char *name)
 }
 
 static grub_err_t
-grub_cmd_serial (grub_extcmd_t cmd, int argc, char **args)
+grub_cmd_serial (grub_extcmd_context_t ctxt, int argc, char **args)
 {
-  struct grub_arg_list *state = cmd->state;
+  struct grub_arg_list *state = ctxt->state;
   char pname[40];
   char *name = NULL;
   struct grub_serial_port *port;
diff --git a/grub-core/tests/lib/functional_test.c b/grub-core/tests/lib/functional_test.c
index 6aafe4dbb..82bf372c0 100644
--- a/grub-core/tests/lib/functional_test.c
+++ b/grub-core/tests/lib/functional_test.c
@@ -22,7 +22,7 @@
 #include <grub/test.h>
 
 static grub_err_t
-grub_functional_test (struct grub_extcmd *cmd __attribute__ ((unused)),
+grub_functional_test (grub_extcmd_context_t ctxt __attribute__ ((unused)),
 		      int argc __attribute__ ((unused)),
 		      char **args __attribute__ ((unused)))
 {
diff --git a/grub-core/tests/test_blockarg.c b/grub-core/tests/test_blockarg.c
new file mode 100644
index 000000000..bb6f3c3f0
--- /dev/null
+++ b/grub-core/tests/test_blockarg.c
@@ -0,0 +1,51 @@
+/* test_blockarg.c - print and execute block argument  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2010  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/err.h>
+#include <grub/misc.h>
+#include <grub/i18n.h>
+#include <grub/extcmd.h>
+#include <grub/script_sh.h>
+
+static grub_err_t
+test_blockarg (grub_extcmd_context_t ctxt, int argc, char **args)
+{
+  if (! ctxt->script)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "no block parameter");
+
+  grub_printf ("%s\n", args[argc - 1]);
+  grub_script_execute (ctxt->script);
+  return GRUB_ERR_NONE;
+}
+
+static grub_extcmd_t cmd;
+
+GRUB_MOD_INIT(test_blockarg)
+{
+  cmd = grub_register_extcmd ("test_blockarg", test_blockarg,
+			      GRUB_COMMAND_FLAG_BOTH | GRUB_COMMAND_FLAG_BLOCKS,
+			      N_("BLOCK"),
+			      N_("Print and execute block argument."), 0);
+}
+
+GRUB_MOD_FINI(test_blockarg)
+{
+  grub_unregister_extcmd (cmd);
+}
diff --git a/include/grub/command.h b/include/grub/command.h
index 6bd3d07c9..599b99437 100644
--- a/include/grub/command.h
+++ b/include/grub/command.h
@@ -37,6 +37,8 @@
 #define GRUB_COMMAND_FLAG_EXTCMD	0x10
 /* This is an dynamic command.  */
 #define GRUB_COMMAND_FLAG_DYNCMD	0x20
+/* This command accepts block arguments.  */
+#define GRUB_COMMAND_FLAG_BLOCKS	0x40
 
 struct grub_command;
 
diff --git a/include/grub/extcmd.h b/include/grub/extcmd.h
index 03eaba8f8..773e47854 100644
--- a/include/grub/extcmd.h
+++ b/include/grub/extcmd.h
@@ -21,10 +21,12 @@
 
 #include <grub/lib/arg.h>
 #include <grub/command.h>
+#include <grub/script_sh.h>
 
 struct grub_extcmd;
+struct grub_extcmd_context;
 
-typedef grub_err_t (*grub_extcmd_func_t) (struct grub_extcmd *cmd,
+typedef grub_err_t (*grub_extcmd_func_t) (struct grub_extcmd_context *ctxt,
 					  int argc, char **args);
 
 /* The argcmd description.  */
@@ -38,11 +40,21 @@ struct grub_extcmd
   const struct grub_arg_option *options;
 
   void *data;
-
-  struct grub_arg_list *state;
 };
 typedef struct grub_extcmd *grub_extcmd_t;
 
+/* Command context for each instance of execution.  */
+struct grub_extcmd_context
+{
+  struct grub_extcmd *extcmd;
+
+  struct grub_arg_list *state;
+
+  /* Script parameter, if any.  */
+  struct grub_script *script;
+};
+typedef struct grub_extcmd_context *grub_extcmd_context_t;
+
 grub_extcmd_t grub_register_extcmd (const char *name,
 				    grub_extcmd_func_t func,
 				    unsigned flags,
@@ -50,6 +62,18 @@ grub_extcmd_t grub_register_extcmd (const char *name,
 				    const char *description,
 				    const struct grub_arg_option *parser);
 
+grub_extcmd_t grub_register_extcmd_prio (const char *name,
+					 grub_extcmd_func_t func,
+					 unsigned flags,
+					 const char *summary,
+					 const char *description,
+					 const struct grub_arg_option *parser,
+					 int prio);
+
 void grub_unregister_extcmd (grub_extcmd_t cmd);
 
+grub_err_t
+grub_extcmd_dispatcher (struct grub_command *cmd, int argc, char **args,
+			struct grub_script *script);
+
 #endif /* ! GRUB_EXTCMD_HEADER */
diff --git a/include/grub/script_sh.h b/include/grub/script_sh.h
index ec51b4785..7952fff9b 100644
--- a/include/grub/script_sh.h
+++ b/include/grub/script_sh.h
@@ -40,8 +40,13 @@ struct grub_script_cmd
 
 struct grub_script
 {
+  unsigned refcnt;
   struct grub_script_mem *mem;
   struct grub_script_cmd *cmd;
+
+  /* grub_scripts from block arguments.  */
+  struct grub_script *next_siblings;
+  struct grub_script *children;
 };
 
 typedef enum
@@ -50,7 +55,8 @@ typedef enum
   GRUB_SCRIPT_ARG_TYPE_TEXT,
   GRUB_SCRIPT_ARG_TYPE_DQVAR,
   GRUB_SCRIPT_ARG_TYPE_DQSTR,
-  GRUB_SCRIPT_ARG_TYPE_SQSTR
+  GRUB_SCRIPT_ARG_TYPE_SQSTR,
+  GRUB_SCRIPT_ARG_TYPE_BLOCK
 } grub_script_arg_type_t;
 
 /* A part of an argument.  */
@@ -60,6 +66,9 @@ struct grub_script_arg
 
   char *str;
 
+  /* Parsed block argument.  */
+  struct grub_script *script;
+
   /* Next argument part.  */
   struct grub_script_arg *next;
 };
@@ -69,6 +78,7 @@ struct grub_script_argv
 {
   unsigned argc;
   char **args;
+  struct grub_script *script;
 };
 
 /* A complete argument.  It consists of a list of one or more `struct
@@ -223,6 +233,9 @@ struct grub_parser_param
   /* The memory that was used while parsing and scanning.  */
   struct grub_script_mem *memused;
 
+  /* The block argument scripts.  */
+  struct grub_script *scripts;
+
   /* The result of the parser.  */
   struct grub_script_cmd *parsed;
 
@@ -232,6 +245,8 @@ struct grub_parser_param
 void grub_script_init (void);
 void grub_script_fini (void);
 
+void grub_script_mem_free (struct grub_script_mem *mem);
+
 void grub_script_argv_free    (struct grub_script_argv *argv);
 int grub_script_argv_next     (struct grub_script_argv *argv);
 int grub_script_argv_append   (struct grub_script_argv *argv, const char *s);
@@ -293,8 +308,8 @@ struct grub_lexer_param *grub_script_lexer_init (struct grub_parser_param *parse
 void grub_script_lexer_fini (struct grub_lexer_param *);
 void grub_script_lexer_ref (struct grub_lexer_param *);
 void grub_script_lexer_deref (struct grub_lexer_param *);
-void grub_script_lexer_record_start (struct grub_parser_param *);
-char *grub_script_lexer_record_stop (struct grub_parser_param *);
+unsigned grub_script_lexer_record_start (struct grub_parser_param *);
+char *grub_script_lexer_record_stop (struct grub_parser_param *, unsigned);
 int  grub_script_lexer_yywrap (struct grub_parser_param *, const char *input);
 void grub_script_lexer_record (struct grub_parser_param *, char *);
 
@@ -371,4 +386,24 @@ grub_script_execute_arglist_to_argv (struct grub_script_arglist *arglist, int *c
 grub_err_t
 grub_normal_parse_line (char *line, grub_reader_getline_t getline);
 
+static inline struct grub_script *
+grub_script_ref (struct grub_script *script)
+{
+  if (script)
+    script->refcnt++;
+  return script;
+}
+
+static inline void
+grub_script_unref (struct grub_script *script)
+{
+  if (! script)
+    return;
+
+  if (script->refcnt == 0)
+    grub_script_free (script);
+  else
+    script->refcnt--;
+}
+
 #endif /* ! GRUB_NORMAL_PARSER_HEADER */
diff --git a/tests/grub_script_blockarg.in b/tests/grub_script_blockarg.in
new file mode 100644
index 000000000..783cee8e0
--- /dev/null
+++ b/tests/grub_script_blockarg.in
@@ -0,0 +1,41 @@
+#! /bin/bash
+
+# Run GRUB script in a Qemu instance
+# Copyright (C) 2010  Free Software Foundation, Inc.
+#
+# GRUB is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# GRUB is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+
+error_if_not () {
+    if test "$1" != "$2"; then
+	echo "[$1]" != "[$2]"
+	exit 1
+    fi
+}
+
+cmd='test_blockarg { true }'
+v=`echo "$cmd" | @builddir@/grub-shell`
+error_if_not "$v" '{ true }'
+
+tmp=`mktemp`
+cmd='test_blockarg { test_blockarg { true } }'
+echo "$cmd" | @builddir@/grub-shell >$tmp
+error_if_not "`head -n1 $tmp|tail -n1`" '{ test_blockarg { true } }'
+error_if_not "`head -n2 $tmp|tail -n1`" '{ true }'
+
+cmd='test_blockarg { test_blockarg { test_blockarg { true } }; test_blockarg { true } }'
+echo "$cmd" | @builddir@/grub-shell >$tmp
+error_if_not "`head -n1 $tmp|tail -n1`" '{ test_blockarg { test_blockarg { true } }; test_blockarg { true } }'
+error_if_not "`head -n2 $tmp|tail -n1`" '{ test_blockarg { true } }'
+error_if_not "`head -n3 $tmp|tail -n1`" '{ true }'
+error_if_not "`head -n4 $tmp|tail -n1`" '{ true }'