There are several ways to list, display, and view cron jobs on a Linux system. Here are a few options:
List the crontab file for the current user:
To list the crontab file for the current user, use the crontab -l command. This will display a list of all cron jobs that are scheduled to run for the current user.
List the crontab files for all users:
To list the crontab files for all users on the system, you can use the ls /var/spool/cron command. This will list the directories for each user that has a crontab file. You can then use the crontab -l -u <username> command to view the crontab file for a specific user.
View the system-wide cron jobs:
The system-wide cron jobs are stored in the /etc/crontab file and in the /etc/cron.d directory. You can view these jobs by using the cat command to display the contents of these files and directories. For example, you can use the command cat /etc/crontab to view the system-wide cron jobs that are stored in the /etc/crontab file.
Use the cron daemon log:
The cron daemon logs all cron job activity to the /var/log/cron file. You can use the tail command to view the latest entries in this log file. For example, you can use the command tail -f /var/log/cron to view the cron job log in real-time as new entries are added.
Note that you may need to use the sudo command to gain the necessary permissions to view certain cron job files and logs.