Crontab command allows you to schedule the execution of tasks on a regular basis.
For instance, you can schedule the execution of shell scripts on a flexible schedule instead of manually invoking those shell scripts.
How Crontab works
Here are the points to keep in mind:
- Crontab tasks do not inherit the environment of a specific user, which means that you must ensure that all required environment variables are set properly (such as invoking a script that contains those variables).
- You can schedule a task to run based on the following:
an hourly, daily, or weekly basis a specific day of the month a specific month or year
The following command displays the currently scheduled jobs for your machine:
$ sudo crontab
In other ways, you can use crontab -l to list all the jobs present.
$ sudo crontab -l
You need to be either the root user or use
sudo in order to modify
crontab (in the
/usr/bin directory) with the following command:
$ sudo crontab -e
The following command replaces the current set of jobs with the jobs in the file
$ crontab -r < crontab.new
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