From 795c8ea75bce45cdd5d10cb7f4b72ad9219a617b Mon Sep 17 00:00:00 2001
From: Mark Hills <mark@xwax.org>
Date: Tue, 21 May 2013 21:35:51 +0100
Subject: [PATCH] Always use set -u to avoid confusion

---
 bpm-graph | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/bpm-graph b/bpm-graph
index 3ab26be..0072f93 100755
--- a/bpm-graph
+++ b/bpm-graph
@@ -21,7 +21,7 @@
 # View graph of BPM analysis
 #
 
-set -e
+set -eu
 
 usage()
 {
@@ -35,13 +35,11 @@ See the bpm-graph(1) man page for more information.
 END
 }
 
-if [ -z "$1" ] || [ "$1" = "-h" ]; then
+if [ -z "${1-}" ] || [ "$1" = "-h" ]; then
 	usage >&2
 	exit 1
 fi
 
-set -u
-
 FILE="$1"
 shift