Okay, thank you to everyone, I think it works now... I created a job with this line: 10,11,12 00-01 * * * /bin/echo > /home/vincent/essai.txt and the file was created as expected on 00:10, then modified a minute later, then re-modified again one minute later ! :o) So it works. Thanks guys... Regards, Vince, on to the next problem ;o)