I write a maintenance script with different commands. the script has sudo commands inside.

Now I want to use crontab, but my first problem is: How can I use the script on user level without root privilegs? Is that possible?

After that I want to copy the script on /usr/local/maintenance and want to use crontab to run the script every first thursday f.e.

EDIT: ok, I decide it now for launchD. Now I have a plist in Global Agents, it works fine. But only the user files. How can I use launchD for sudo commands?

  • This should be two questions also why do you want to copy the script and not just run it from that oath? If the script has sudo it requires raised privileges and so has to run as root or another user
    – mmmmmm
    Commented May 30, 2016 at 20:05
  • the script should also run, when the user is not in my network. Or what u mean with "why do you want to copy the script and not just run it from that oath?" I don't understand the other senteance: ok, forget root. I want to execute it with sudo but with logged user (f.e. the script delete user cache but also system cache).
    – D.K.
    Commented May 30, 2016 at 20:15
  • crontab can't execute sudo given that they are clearing caches I would write as two separate scripts one for local and one for system
    – mmmmmm
    Commented May 30, 2016 at 20:21
  • @Mark I see. And with of the scripts execute the other script? local -> system or system local. the script is like this: rm -rf ~/Library/Caches sudo rm -rf /System/Library/Caches
    – D.K.
    Commented May 31, 2016 at 7:01
  • The idea of the split is to allow one to run as root and the other as local the issue is that combining them gives you the sudo issue. So easier to use two scripts.
    – mmmmmm
    Commented May 31, 2016 at 11:47

1 Answer 1


First, the best way to run a cron script as root is to add it to the root user's crontab. EDITOR="vi" ; sudo crontab -u root -e will allow you to edit the root crontab. Once you are doing that you don't need to use `sudo; inside your script.

As for running it every Thursday, check the man page for the crontab table man crontab -s 5 and it will explain all you need to know.

  • sudo crontab -u root doesn't work. when I try crontab -e -u root I take an editor, but It doesn't save it. I try * 13 * * 5 script.sh
    – D.K.
    Commented May 31, 2016 at 6:58
  • OK, I edited the command to fix the possible problem of editing the crontab. The old version worked for me but not in a vanilla bash. Commented Jun 1, 2016 at 22:09

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