Simultaneous Runs

[EvansEd]

I am sort of new to UNIX and don't know much of the commands, there I have this question to ask of you guys.

I have a unix script that is on a schedule to run every friday at 5pm, and to also run on last day of month at 5pm. There will be cases when the two criterias above are true, therefore causing the same job to run simultaneously. Are there any UNIX statements that would avoid this situation from occuring?

Thanks much for your help!

 

[mrregan]

The easy way would be to duplicate the script and put a test in the end of month something like:
if `date +%a` = "Fri" then
exit
else do something
fi