bash - Shell script not running via crontab, but runs fine manually

Question

I have a script that checks if pptp vpn is running , and if not it reconnect the pptp vpn , when i run the script manually it execute fine , when i do set a cron job , is not running

* * * * * /bin/bash /var/scripts/vpn-check.sh

here comes the script:

#!/bin/sh
/bin/ping -c3 192.168.17.27 > /tmp/pingreport
result=`grep "0 received" /tmp/pingreport`
truncresult="`echo "$result" | sed 's/^(.................................).*$$'`"
if [[ $truncresult == "3 packets transmitted, 0 received" ]]; then
/usr/sbin/pppd call home
fi

Answer 1

finally i found a solution ... instead of entering the cronjob with

crontab -e

i needed to edit the crontab file directly

nano /etc/crontab

adding e.g. something like

*/5 *     * * *   root  /bin/bash /var/scripts/vpn-check.sh

and its fine now!

Thank you all for your help ... hope my solution will help other people as well.