From 591603fcdb0660ec6689019e39437c2d9e513229 Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Mon, 14 Jan 2019 15:18:32 +0800
Subject: cli/jpg2pdf.sh: Add simple usage

---
 cli/jpg2pdf.sh | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/cli/jpg2pdf.sh b/cli/jpg2pdf.sh
index ac992af..9041009 100755
--- a/cli/jpg2pdf.sh
+++ b/cli/jpg2pdf.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 #
 #############################################################################
-#  
+#
 #  Shellscript to convert a set of JPEG files to a multipage PDF.
 #
 #  Requirements: (1) Ghostscript needs to be installed on the local system.
@@ -18,6 +18,12 @@
 #
 #############################################################################
 
+if [ $# -lt 2 ]; then
+    echo "Usage:"
+    echo "    `basename $0` output.pdf 1.jpg ..."
+    exit 1
+fi
+
 outfile=$1
 shift
 
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