From 6bc21456127bcaa1504f5700c55a3fe46ea6da6a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20Ortega=20Froysa?= <nicolas@ortegas.org>
Date: Mon, 2 Mar 2026 15:33:43 +0100
Subject: [PATCH] Add help information upon misuse.

---
 countdown.sh | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/countdown.sh b/countdown.sh
index 717ebe1..ffea337 100755
--- a/countdown.sh
+++ b/countdown.sh
@@ -22,16 +22,19 @@
 # 3. This notice may not be removed or altered from any source
 #    distribution.
 
-if [ -z $1 ]
+set -euo pipefail
+
+if [ $? -gt 1 ]
 then
-	COUNT=5
-else
-	COUNT=$1
+	echo "Usage: $0 [COUNT]"
+	exit 1
 fi
 
-for i in $(seq $COUNT -1 1)
+COUNT=${1:-5}
+
+for i in $(seq "$COUNT" -1 1)
 do
-	echo $i
+	echo "$i"
 	sleep 1
 done