1 files changed, 4 insertions, 0 deletions
diff --git a/bin/u2d b/bin/u2d
index 5b4a96b6..662876e3 100755
--- a/bin/u2d
+++ b/bin/u2d
@@ -1,4 +1,8 @@
 #!/bin/sh
+if [ "$#" -eq 0 ] ; then
+    printf >&2 'u2d: Need a filename\n'
+    exit 2
+fi
 r=$(printf '\r')
 for fn ; do
     ed -s -- "$fn" <<EOF || ex=1