Fix bashism/non-POSIX usage of $UID.

[grml-network.git] / sbin / grml-vnet

diff --git a/sbin/grml-vnet b/sbin/grml-vnet
index 82aca72..7fa0d95 100755 (executable)
--- a/sbin/grml-vnet
+++ b/sbin/grml-vnet
@@ -16,6 +16,9 @@ OPT_GROUP_=''
 OPT_BRIDGE_=''
 OPT_AUTO_='false'
 
+if [ $(id -ru) -ne 0 ] ; then
+  echo 1>&2 "Error: please run this script with uid 0 (root)." ; exit 1
+fi
 
 function printUsage()
 {