Don't show output from `which dialog` in setsched

Prevents `which dialog` from outputting (ugly) information to stderr
in the case that dialog is not installed.

Changes error message to make it more clear that dialog is strictly
optional.

1 files changed, 4 insertions, 5 deletions

diff --git a/setsched b/setsched
index bae94d4..0714f46 100755
--- a/setsched
+++ b/setsched
@@ -4,7 +4,7 @@
 
 ADIR=/proc/litmus/active_plugin
 PDIR=/proc/litmus/plugins/loaded
-DIALOG=`which dialog`
+DIALOG=`which dialog 2> /dev/null`
 
 CHOICE=$1
 
@@ -22,10 +22,9 @@ if [ -z "$1" ]; then
     # Check for presence of dialog, some distros don't install it by default.
     if [ -z "$DIALOG" ]; then
         echo "Error: The dialog utility cannot be found."
-        echo "       Please install the required package (dialog on Ubuntu)."
-        echo "       Note that you can also use setsched by passing the"
-        echo "       desired scheduling plugins as a commandline argument,"
-        echo "       i.e., 'setsched GSN-EDF' activates GSN-EDF."
+        echo "       Please install the required package (dialog on Ubuntu),"
+        echo "       or specify the desired plugin as a commandline argument,"
+        echo "       e.g., 'setsched GSN-EDF'."
         exit 2
     fi
     TMP=`mktemp`