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I am running crontab as root user:

screen -S konsola -X stuff 'say hello'`echo -ne '\015'`

How do I run it as the user "nobody"? Only this user has screen with given pid, thats why I need it.

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Can't you just use crontab -u nobody -e to add your command to nobody's crontab?

Otherwise I would just put this in the root crontab:

su nobody -c "screen -S konsola -X stuff 'say hello'`echo -ne '\015'`"

From the man page:

The su command is used to become another user during a login session.
[...]
 -c, --command  COMMAND
    Specify a command that will be invoked by the shell using its -c.
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nobody user cant do cronjobs/tab - hes not privillaged to. what crontab -u nobody -e does? –  Ultra Sep 18 '12 at 18:25
    
It edits the crontab file of user nobody –  m4573r Sep 18 '12 at 18:26
    
As I said nobody user cant run crontab. Is there a way to let him run it only for one *.sh? –  Ultra Sep 18 '12 at 18:28
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