cron tabs (schedule)

scheduler but a hard one

Users may want to schedule a certain action or task to take place after the system has booted. Take, for example, running commands, backing up files, or launching your favourite programs on, such as Spotify or Google Chrome.

to edit cron tabs enter crontab -e, and this file opens up:

A crontab is simply a special file with formatting that is recognised by the cron process to execute each line step-by-step. Crontabs require 6 specific values:

Value	Description
MIN	What minute to execute at
HOUR	What hour to execute at
DOM	What day of the month to execute at
MON	What month of the year to execute at
DOW	What day of the week to execute at
USER	What user the command will run as
CMD	The actual command that will be executed.

as shown in the image the format for scheduling a command is:

[MIN] [HOUR] [DOM] [MON] [DOW] [CMD]

e.g. 0 */12 * * * cp -R /home/cmnatic/Documents /var/backups/ is executed every 12 hours.

m h dom mon dow user command

17 * 1 * * * root cd / && run-parts --report /etc/cron.hourly

Crontab Generator and Cron Guru can help you create it.