From f5a6131b37db54d518651c7af564d03690a0d281 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Wed, 2 Jan 2019 21:06:29 +0100
Subject: backup.in: exactly one parameter is acceptable, too

---
 backup.in | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/backup.in b/backup.in
index 6723699..bfe3e61 100755
--- a/backup.in
+++ b/backup.in
@@ -15,6 +15,7 @@ usage()
 Backup files from remote with rsync, possibly via SSH-tunnel.
 
 With no arguments, information is expected to be in array $backups in #ETCDIR#/backup.conf with name of executable (e.g. a symlink) as key.
+With one argument, information is expected to be in array ${backups[$1]} in #ETCDIR#/backup.conf.
 
 Options:
   /tmp/pidFile           location of file to store PID in
@@ -36,8 +37,12 @@ if [ $# -eq 1 ]; then
 fi
 
 seldom=false
-if [ $# -eq 0 ]; then
-  backupID="$(basename $0)"
+if [ $# -eq 0 ] || [ $# -eq 1 ]; then
+  if [ $# -eq 0 ]; then
+    backupID="$(basename $0)"
+  else
+    backupID="$1"
+  fi
   [ -z "${backups[${backupID}]}" ] && usage
   set /tmp/${backupID}.pid ${backups[${backupID}]}
   if printf '%s\n' "${seldomBackups[@]}" | \
-- 
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