Should I have a single cron job that loops the users, or one for each user?

1. How do I list all cron jobs for all users?
2. Can two cron jobs run simultaneously?
3. How do I run a cron job as a specific user?
4. How can I tell if a cron job is running?
5. How do I find Cron users?
6. Which user does crontab run as?
7. How do I run multiple cron jobs?
8. How often can cron jobs run?
9. How do I put a cron job on hold?
10. How do I run a script in a different user?
11. How do I debug Cron?
12. Are cron jobs run as root?

How do I list all cron jobs for all users?

You can find them in /var/spool/cron/crontabs. The tables contain the cron jobs for all users, except the root user. The root user can use the crontab for the whole system. In RedHat-based systems, this file is located at /etc/cron.

Can two cron jobs run simultaneously?

3 Answers. Yes, it is perfectly acceptable to have cron schedule multiple jobs at the same time. Computers do nothing simultaneously, however, and they will be started in the order present in the cron table.

How do I run a cron job as a specific user?

Or more simply, you could just run crontab -e when logged in as that user. Alternatively, you could prefix your command in your (root) crontab with sudo -u <username> to run the command as the specified user.

How can I tell if a cron job is running?

log file, which is in the /var/log folder. Looking at the output, you will see the date and time the cron job has run. This is followed by the server name, cron ID, the cPanel username, and the command that ran. At the end of the command, you will see the name of the script.

How do I find Cron users?

To verify that a crontab file exists for a user, use the ls -l command in the /var/spool/cron/crontabs directory. For example, the following display shows that crontab files exist for users smith and jones. Verify the contents of user's crontab file by using crontab -l as described in "How to Display a crontab File".

Which user does crontab run as?

Correct? That's correct, if you run crontab -e it will execute as your user. Your scheduled cron jobs also run as your main user, but they don't use the PATH settings that your user has. For that reason, we recommend that you use the full path to any executable that you run, eg use /usr/local/bin/python2.

How do I run multiple cron jobs?

FACT: you can run as many cron jobs from a single crontab file as you wish. FACT: you can also run different jobs as different users, each with their own crontab file. SUGGESTION: 1) Just debug what's wrong with your second job.

How often can cron jobs run?

Unfortunately cronjobs can run only at a maximum of once per minute. So in the worst-case a user has to wait one minute until his Email is really going to be sent.

How do I put a cron job on hold?

6 Answers. touch /var/spool/cron/crontabs/$username; chmod 0 /var/spool/cron/crontabs/$username should do the trick. Restore with chmod 600 and touch (you need to change the file's mtime to make cron (attempt to) reload it).

How do I run a script in a different user?

You can make user1 the only user who is allowed to execute the script by making it the owner of the file or leave root as owner and group, set the simple access permissions ( chmod ) to 770 and add user1 with ACLs ( setfacl ). user1 can only be root. You then also don't need to put -u root to your sudo command.

How do I debug Cron?

Tips on how to debug cron:

1. change the schedule for the cron job so it runs every minute. It's harder to debug something that happens infrequently.
2. Make sure syslog sends cron logs to /var/log/cron.log. ...
3. Follow the log file to track cron's activity. ...
4. Make sure the cron job user can receive mail.

Are cron jobs run as root?

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.