How to know if a program is running

Dear all.

I have problem with this simple script. It simply:
if xpenguins is running
    kill it
    run it

The script is as follow:
if [ `ps -ax | grep xpenguins` ]; then
    skill xpenguins
    xpenguins -n 10 -all

The problem is, ' ps -ax | grep xpenguins' always return true.
Please suggest the better way.


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It's because the result of 'ps -ax' also contains the current command 'grep xpenguins'.
if [ `ps -ax | grep xpenguins | grep -v grep` ]; then
if [ -n "`pidof xpenguins`" ]; then
if [ `ps -ax | grep xpenguins | grep -v grep` ]; then

A neater solution (only one call to grep) is:
if [ `ps -ax | grep [x]penguins` ]; then

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KocilAuthor Commented:
Nice answers...,
but I like glassd's most.

Thanks guys.
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