From 1f87313ac830970088389a6d6e68fa3ce8194aff Mon Sep 17 00:00:00 2001
From: LOLi <loli10K@users.noreply.github.com>
Date: Sat, 18 Aug 2018 22:10:36 +0200
Subject: [PATCH] Fix arcstat.py handling of unsupported options

This change allows the arcstat.py script to handle unsupported options
gracefully and print both error and usage messages when one such option
is provided.

Reviewed-by: Giuseppe Di Natale <guss80@gmail.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Closes #7799
---
 cmd/arcstat/arcstat.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmd/arcstat/arcstat.py b/cmd/arcstat/arcstat.py
index 85c83ccc4..b52a8c294 100755
--- a/cmd/arcstat/arcstat.py
+++ b/cmd/arcstat/arcstat.py
@@ -285,7 +285,7 @@ def init():
             ]
         )
     except getopt.error as msg:
-        sys.stderr.write(msg)
+        sys.stderr.write("Error: %s\n" % str(msg))
         usage()
         opts = None