There are two easy ways...

If your file creates a lock file when it starts and removes it when it 
finishes, a chec to see if the file exists will tell you if the script is 
already running./

On linux / unix systems do a ps and looks for any occurrances of your 
script name. If there are more than one, then die....


R


At 11:18 30/09/2002 +0200, Theuerkorn Johannes wrote:
>Hello List,
>
>i have a perl script that i have running from a cron Job. It usually opens 
>every 4 hours. But sometimes it takes the script longer to execute its job 
>so after cron opens up the perl script as usual, i have two perl jobs running.
>Is there any possibility to check weather the script is already running? 
>Maybe i can use a system command in the crontab?
>
>any help welcoe
>
>greets Johannes
>
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