fetchmail and watch command

What I'm trying to do is enable the watch command to run a prog named fetchmail.run.
The following command string does not work when run in the background (it
works ok from the foreground):

watch -n 30 fetchmail.run > /dev/null &
 
fetchmail.run
if ["`ps --User matias | grep fetchmail`" == ""]; then
/usr/bin/fetchmail -f ~/.fetchmailrc --mda "procmail -f %F" > /dev/null 2>&1; fi

Is there some technique to fix this that's concise and easy to understand?

thx.,
matias.
~

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