From 593cf4a9f36b26ef8f00046336152d359ca356e2 Mon Sep 17 00:00:00 2001
From: Jeremy Lecour <jlecour@evolix.fr>
Date: Fri, 11 Mar 2022 11:36:20 +0100
Subject: [PATCH] show usage if list has no argument, instead of "set -u" error

---
 shellpki | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/shellpki b/shellpki
index f04e552..e6b9b00 100755
--- a/shellpki
+++ b/shellpki
@@ -763,7 +763,7 @@ list() {
         exit 0
     fi
 
-    if [ -z "${1}" ]; then
+    if [ -z "${1:-}" ]; then
         show_usage >&2
         exit 1
     fi
@@ -772,7 +772,7 @@ list() {
     list_revoked=1
 
     while :; do
-        case "${1}" in
+        case "${1:-}" in
             -a|--all)
                 list_valid=0
                 list_revoked=0