1 files changed, 28 insertions, 8 deletions
diff --git a/backup.in b/backup.in
index 0a61933..33a59f3 100755
--- a/backup.in
+++ b/backup.in
@@ -1,18 +1,38 @@
 #!/bin/bash
 
-. #ETCDIR#/backup.conf
+[ -r "#ETCDIR#/backup.conf" ] && \
+  . "#ETCDIR#/backup.conf"
 
 usage()
 {
-  >&2 echo 'This is backup version #VERSION#'
-  >&2 echo ''
-  >&2 echo 'usage:'
-  >&2 echo ' backup /tmp/pidFile /path/to/destination/ user@source:path'
-  >&2 echo ' backup /tmp/pidFile /path/to/destination/ user@source:path proxy_user@ssh_host'
-  >&2 echo 'or as a symlink (e.g. in /etc/cron/daily) named after a key of $backups in #ETCDIR#/backup.conf without arguments'
-  exit 1
+  >&2 echo \
+'Usage:  backup /tmp/pidFile /path/to/destination/ user@source:path [proxy_user@ssh_host]
+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.
+
+Options:
+  /tmp/pidFile           location of file to store PID in
+  /path/to/destination   location to store backups in
+  user@source:path       remote data to back up
+  proxy_user@ssh_host    ssh login to proxy node (optional)
+#HELPTEXT#              #'
+  [ -z "$1" ] && exit 1
+  exit $1
 }
 
+if [ $# -eq 1 ]
+then
+  if [ "$1" == "--help" ]
+  then
+    usage 0
+  elif [ "$1" == "--version" ]
+  then
+    echo '#VERSION#'
+    exit
+  fi
+fi
+
 if [ $# -eq 0 ]
 then
   backupID="$(basename $0)"