To cope with shell archive file generated by GNU sharutils 4.2.

(it assumes that shar will bark if there's invalid argument specified)

Patch suggested by Ulrich Drepper <drepper@ipd.info.uni-karlsruhe.de>.

Reviewed by:	joerg_wunsch@uriah.heep.sax.de

usr.bin/shar/shar.sh

@@ -35,10 +35,18 @@
 #
 
 if [ $# -eq 0 ]; then
-	echo 'usage: shar file ...'
-	exit 1
+	echo 'usage: shar file ...' 1>&2
+	exit 64			# EX_USAGE
 fi
 
+for i
+do
+	if [ ! -e $i ]; then
+		echo "$i does not exist" 1>&2
+		exit 66		# EX_NOINPUT
+	fi
+done
+
 cat << EOF
 # This is a shell archive.  Save it in a file, remove anything before
 # this line, and then unpack it by entering "sh file".  Note, it may