how can i check if a unix script is already running

Pls see the following code where i am trying to
check if a unix script is running or not.

1. check.ksh
------------------
#!/bin/ksh
if ps -ef | grep "myscript.ksh" >/dev/null
then
echo "my script running"
else
echo "my script not running"
fi
-------------------

Above, check.ksh checks to see if "myscript.ksh" is running or not.
i can see that it works when the "myscript.ksh" is NOT RUNNING.

i run my "myscript.ksh" and it executes successfully.

Now when i run "check.ksh", it still shows that "myscript.ksh" is RUNNING, while in fact "myscript.ksh" is stopped alltogether.

Any answers pls as to y this is happening.

i have tried to see by myself if "myscript.ksh" is running even after it exceuted successfully by typing:

$ ps -ef | grep "myscript.ksh"

output:
loginid 22232 9841 0 12:52:15 pts/1 0:00 grep myscript.ksh

change:
ps -ef | grep "myscript.ksh" >/dev/null

to:
ps -ef | grep "myscript.ksh" | grep -v grep >/dev/null

It is seeing its' own grep process. The 'grep -v' pipe will ignore anything with grep in it.

hi faulkner

thanks a bunch. The script is working now.
Appreciate ur quick and solid help

thnx