Add an option to make periodic(8) quiet when no output was generated.

The man page part of the patch is my fault, the changes to the
periodic script is Dominik's.

PR:		88486
Submitted by:	Dominik Brettnacher <domi@saargate.de>
Reviewed by:	brian
Approved by:	re
MFC after:	1 month

1 files changed, 8 insertions, 5 deletions

diff --git a/usr.sbin/periodic/periodic.sh b/usr.sbin/periodic/periodic.sh
index 73e8576..ca954ea 100644
--- a/usr.sbin/periodic/periodic.sh
+++ b/usr.sbin/periodic/periodic.sh
@@ -40,11 +40,11 @@ do
     case "$output" in
     /*) pipe="cat >>$output";;
     "") pipe=cat;;
-    *)  pipe="mail -s '$host ${arg##*/} run output' $output";;
+    *)  pipe="mail -E -s '$host ${arg##*/} run output' $output";;
     esac
 
-    success=YES info=YES badconfig=NO	# Defaults when ${run}_* aren't YES/NO
-    for var in success info badconfig
+    success=YES info=YES badconfig=NO empty_output=YES	# Defaults when ${run}_* aren't YES/NO
+    for var in success info badconfig empty_output
     do
         case $(eval echo "\$${arg##*/}_show_$var") in
         [Yy][Ee][Ss]) eval $var=YES;;
@@ -95,8 +95,11 @@ do
         done
         if [ $empty = TRUE ]
         then
-          [ $processed = 1 ] && plural= || plural=s
-          echo "No output from the $processed file$plural processed"
+          if [ $empty_output = TRUE ]
+          then
+            [ $processed = 1 ] && plural= || plural=s
+            echo "No output from the $processed file$plural processed"
+          fi
         else
           echo ""
           echo "-- End of $arg output --"