How do I adjust crontab?
The most common way to edit your crontab is to use the -e flag with the crontab command: crontab -e . This command will open your crontab file in the system's default text editor. You can then edit and make changes as needed. Remember to save your changes when you're finished editing and exit the editor.
What command is used to add or update job in crontab?
/etc/crontab is system crontabs file. Usually only used by root user or daemons to configure system wide jobs. All individual user must must use crontab command to install and edit their jobs as described above. /var/spool/cron/ or /var/cron/tabs/ is directory for personal user crontab files.