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Help: use monit to monitor a process doesn't work

Hi, sometimes my dhclient process could die without clue, don't know where the log file is.

so i want to use monit to restart dhclient.
This is what i added to /etc/monit/monitrc.
For testing, i'm called echo initially, when eth0's pid file is gone.

check process dhclient with pidfile /var/run/sendsigs.omit.d/network-manager.dhclient-eth0.pid
start program = "/bin/echo dhclient died, do something ..."

but nothing happened after 2 mins (i set in monitrc to check it every 2 mins)

Any suggestions ?

Something like this?

Code:

#!/bin/bash



if pgrep dhcpcd > /dev/null ; or pidof dhcpcd

then

    exit 0

else

    do something 

    exit 1

fi

#EOF