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I have few bash scripts which are adding to cron jobs with specified timing, but it needs to be executed as root user. I am trying to run those scripts i.e., crob jobs but it needs root user permission, since I am running this jobs in ubuntu ec2 instance where root user is restricted. What would be the work around to run those scripts as root user.
Thanks
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You can run a custom cronjob by adding a new line in the /etc/crontab file and specifying the user who will run the command as in the following example. #m h dom mon dow user command * * * * * someuser echo 'Hello world!' Copied! This will echo Hello world! in the terminal every minute.
Like any other user, root has a user crontab. Essentially the same as any other user crontab, you are editing the root crontab when you run sudo crontab -e . Jobs scheduled in the root user crontab will be executed as root with all of its privileges.
They all run as root . If you need otherwise, use su in the script or add a crontab entry to the user's crontab ( man crontab ) or the system-wide crontab (whose location I couldn't tell you on CentOS). Save this answer.
Let me also clarify about situations 1 and 2: cron jobs run independently of any user login sessions, and any programs they're running.
You can make a script execute as root by using the setuid flag, which makes a script run as its owner:
chmod +s yourscript
chown root yourscript
Just make yourscript run whatever command you want to run as root.
Note that with this method, any user can run the script.
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