script to check if process is running

How do I make a shell script to see if a certain process is running.

The process shows up on

Code:
ps aux

as /usr/sbin/daemon

eg:

if [! /usr/sbin/daemon ]
/usr/sbin/daemon
else
#nothin

basically i want to run the process if it isnt running/ has been stopped.

 

Code:
if ps aux | grep '[/]usr/sbin/daemon'
then
     echo Running
else
     /usr/sbin/daemon &
fi