Display usage information if any unknown cmdline option is used

[grml-live.git] / grml-live

diff --git a/grml-live b/grml-live
index c443cd1..3964cbd 100755 (executable)
--- a/grml-live
+++ b/grml-live
@@ -12,6 +12,9 @@
 export LANG=C
 export LC_ALL=C
 
+# avoid leaking into chroots
+unset TMPDIR
+
 # define function getfilesize before "set -e"
 if stat --help >/dev/null 2>&1; then
   getfilesize='stat -c %s'  # GNU stat
@@ -330,7 +333,7 @@ while getopts "a:C:c:d:D:e:g:i:I:o:r:s:t:U:v:AbBFhnNqQuVz" opt; do
     U) CHOWN_USER="$OPTARG" ;;
     V) VERBOSE="-v" ;;
     z) SQUASHFS_ZLIB=1 ;;
-    ?) echo "invalid option -$OPTARG" >&2; bailout 1 ;;
+    ?) echo "invalid option -$OPTARG" >&2; usage; bailout 1 ;;
   esac
 done
 shift $(($OPTIND - 1))  # set ARGV to the first not parsed commandline parameter