Hi
I am working in ksh and need to turn the following "if" statement into "if not" :

if psef op | grep -w fps1 >/dev/null
echo fps1 is running.
else
exit 1
fi

I am getting syntax errors no matter what I do, for example :

n079$ if [[ ! psef op | grep -w fps1 | grep -v grep > /dev/null ]]; then
ksh: syntax error: `op' unexpected

any idea? Thakns a lot for help -A