add mkj's usage message

CVS patchset: 1272 CVS date: 1997/01/13 17:23:43
1997-01-13 17:23:43 +00:00 · 1997-01-13 17:23:43 +00:00 · bd91e242c3
parent 052ae10749
commit bd91e242c3
1 changed files with 6 additions and 0 deletions
--- a/6
+++ b/6
@ -1,5 +1,11 @@
 #!/bin/bash

+[ -z "$1" -o -z "$2" ] && {
+# usage
+  echo "usage: $0 <directory> <diff-extension>" 1>&2
+  exit 1
+}
+
 find $1 \( -name "*$2" -o -name ".*$2" \) -print |
 while read f; do
 	diff -u $f ${f%%$2}