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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.
It is a wildcard for every part of the cron schedule expression. So * * * * * means every minute of every hour of every day of every month and every day of the week .
2 Answers. Show activity on this post. 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).
Then go to the dir /etc/cron. d in this directory you can see that cron. deny file,make an enter of particular user name which user want to block by using vi editor or orther.
Instead of creating a crontab to run as the root user, create a crontab for the user that you want to run the script. In your case, crontab -u www-data -e will edit the crontab for the www-data user. Just put your full command in there and remove it from the root user's crontab.
EDIT: Note that this method won't work with crontab -e, but only works if you edit /etc/crontab directly. Otherwise, you may get an error like /bin/sh: www-data: command not found
Just before the program name:
*/1 * * * * www-data php5 /var/www/web/includes/crontab/queue_process.php >> /var/www/web/includes/crontab/queue.log 2>&1
Since you're running Ubuntu, your system crontab is located at /etc/crontab.
As the root user (or using sudo), you can simply edit this file and specify the user that should run this command. Here is the format of entries in the system crontab and how you should enter your command:
# m h dom mon dow user command
*/1 * * * * www-data php5 /var/www/web/includes/crontab/queue_process.php >> /var/www/web/includes/crontab/queue.log 2>&1
Of course the permissions for your php script and your log file should be set so that the www-data user has access to them.
Mike's suggestion sounds like the "right way". I came across this thread wanting to specify the user to run vncserver under on reboot and wanted to keep all my cron jobs in one place.
I was getting the following error for the VNC cron:
vncserver: The USER environment variable is not set. E.g.:
In my case, I was able to use sudo to specify who to run the task as.
@reboot sudo -u [someone] vncserver ...
You can also try using runuser (as root) to run a command as a different user
*/1 * * * * runuser php5 \
--command="/var/www/web/includes/crontab/queue_process.php \
>> /var/www/web/includes/crontab/queue.log 2>&1"
See also: man runuser
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