0 0,12 1 */2 * /sbin/ping -c 192.168.0.1
becomes
    0 0,12 1 */2 * source .env_file; /sbin/ping -c 192.168.0.1 
or
    0 0,12 1 */2 * . .env_file; /sbin/ping -c 192.168.0.1