X-Git-Url: http://git.grml.org/?a=blobdiff_plain;f=sbin%2Fgrml-vnet;h=82aca72a8e7af97cb5dd237b6e2c3a51c99f24c7;hb=fe2884b84d7f428f8630c1ebb939312ee18ef287;hp=97e4901daa8bda137c78900911477746bb6e436f;hpb=c1a2e60ccc51e1f658def184c3371fe41500c957;p=grml-network.git

diff --git a/sbin/grml-vnet b/sbin/grml-vnet
index 97e4901..82aca72 100755
--- a/sbin/grml-vnet
+++ b/sbin/grml-vnet
@@ -93,6 +93,12 @@ while getopts "du:g:b:ah" opt; do
 done
 shift $(($OPTIND - 1))
 
+if [[ $# < 1 ]]; then
+    echo "Error: Please give at least one device" >&2
+    printUsage
+    exit 1
+fi
+
 if [[ $OPT_DEL_ == 'false' ]]; then
     if [[ $OPT_BRIDGE_ != '' && $OPT_AUTO_ == 'true' ]]; then
         brctl showmacs "$OPT_BRIDGE_" &>/dev/null || brctl addbr "$OPT_BRIDGE_"