Put temporary output in ${TMPDIR:-/tmp}

If $<basedir>_output is not set, don't redirect output

PR:	21395

share/man/man5/periodic.conf.5

@@ -66,8 +66,7 @@ the directory
 If this variable is set to an absolute path name, output is logged to
 that file, otherwise it is taken as one or more space seperated email
 addresses and mailed to those users.
-If this variable is not set, it defaults to
-.Dq root .
+If this variable is not set or is empty, output is sent to standard output.
 .Pp
 For an unattended machine, suitable values for
 .Ar $daily_output ,

usr.sbin/periodic/periodic.8

@@ -127,14 +127,13 @@ output.
 If the
 .Va <basedir>_output
 value does not begin with a
-.Dq / ,
-it is assumed to contain a list of email addresses, and the output is
-mailed to them.
+.Dq /
+and is not empty, it is assumed to contain a list of email addresses, and
+the output is mailed to them.
 .Pp
 If
 .Va <basedir>_output
-is not set, it defaults to
-.Dq root .
+is not set or is empty, output is sent to standard output.
 .Sh ENVIRONMENT
 The 
 .Nm

usr.sbin/periodic/periodic.sh

@@ -27,7 +27,7 @@ fi
 
 host=`hostname`
 export host
-tmp_output=/var/run/periodic.$$
+tmp_output=${TMPDIR:-/tmp}/periodic.$$
 
 # Execute each executable file in the directory list.  If the x bit is not
 # set, assume the user didn't really want us to muck with it (it's a
@@ -39,7 +39,8 @@ do
     eval output=\$${arg##*/}_output
     case "$output" in
     /*) pipe="cat >>$output";;
-    *)  pipe="mail -s '$host ${arg##*/} run output' ${output:-root}";;
+    "") pipe=cat
+    *)  pipe="mail -s '$host ${arg##*/} run output' $output";;
     esac
 
     success=YES info=YES badconfig=NO	# Defaults when ${run}_* aren't YES/NO