The file is stored in /var/spool/cron/crontabs but should only be edited using the crontab command.
Where are crontab files stored?
The crontab files are stored in /var/spool/cron/crontabs . Several crontab files besides root are provided during SunOS software installation (see the following table). Besides the default crontab file, users can create crontab files to schedule their own system events.
How do I view crontab files in Linux?
Listing Cron Jobs in Linux
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.
How do I edit a crontab file in Linux?
How to Create or Edit a crontab File
- Create a new crontab file, or edit an existing file. # crontab -e [ username ] …
- Add command lines to the crontab file. Follow the syntax described in Syntax of crontab File Entries. …
- Verify your crontab file changes. # crontab -l [ username ]
How do I view crontab?
2.To view the Crontab entries
- View Current Logged-In User’s Crontab entries : To view your crontab entries type crontab -l from your unix account.
- View Root Crontab entries : Login as root user (su – root) and do crontab -l.
- To view crontab entries of other Linux users : Login to root and use -u {username} -l.
Is crontab run as root?
2 Answers. 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).
What are crontab files?
A crontab file is a simple text file containing a list of commands meant to be run at specified times. It is edited using the crontab command. The commands in the crontab file (and their run times) are checked by the cron daemon, which executes them in the system background.
How do I know if a cron job is successful?
The simplest way to validate that cron tried to run the job is to simply check the appropriate log file; the log files however can be different from system to system. In order to determine which log file contains the cron logs we can simply check the occurrence of the word cron in the log files within /var/log .
How do I see all crontab for users?
Under Ubuntu or debian, you can view crontab by /var/spool/cron/crontabs/ and then a file for each user is in there. That’s only for user-specific crontab’s of course. For Redhat 6/7 and Centos, the crontab is under /var/spool/cron/ . This will show all crontab entries from all users.
How do I edit crontab entry?
How to Create or Edit a crontab File
- Create a new crontab file, or edit an existing file. $ crontab -e [ username ] …
- Add command lines to the crontab file. Follow the syntax described in Syntax of crontab File Entries. …
- Verify your crontab file changes. # crontab -l [ username ]
How do I backup a crontab file?
You could just backup the entire /var/spool/cron directory. It contains all crontabs of all users. You can periodically run crontab -l > my_crontab. backup to backup the crontab into file.
How do I change sudo crontab?
crontab -e edits the crontab for the current user, so any commands contained within will be ran as the user who’s crontab you are editing. sudo crontab -e will edit the root users crontab, and so the commands within will be run as root. To add on to cduffin, use the minimum permissions rule when running your cronjob.