contrib/freifunk-common: add watch.sh script to simulate the watch command

contrib/package/freifunk-common/files/usr/bin/watch.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+command="$1"
+interval="$2"; [ -z "$interval" ] && interval=1
+
+if [ -z $command ]; then
+        echo 'Usage: watch.sh "command [options]" [interval], e.g. watch "ifconfig ath0" 2'
+        echo 'interval is optional and defaults to 1'
+        exit 1
+fi
+
+while true; do clear; $command; sleep $interval; done