#!/bin/sh
tables="/etc/iproute2/rt_tables"
-[ -z "`grep "gw-check" $tables`" ] && echo "200 gw-check" >> $tables
-[ -z "`grep "ff_olsr_test_gw.sh" /etc/crontabs/root`" ] && echo "* * * * * /usr/sbin/ff_olsr_test_gw.sh" >> /etc/crontabs/root
+[ -z "`grep -q "gw-check" $tables`" ] && echo "200 gw-check" >> $tables
+test -f /etc/crontabs/root || touch /etc/crontabs/root
+[ -z "`grep -q "ff_olsr_test_gw.sh" /etc/crontabs/root`" ] && echo "* * * * * /usr/sbin/ff_olsr_test_gw.sh" >> /etc/crontabs/root
/etc/init.d/cron restart