For scheduling job you should use Cron. It is a time-based job scheduler.

Crontab is a file where jobs are descirbed. You can edit this by calling command:

crontab -e

During first call you can be asked about default text editor. I chose VIM. Each line contains cron expression - the expression which describe frequency of command calling.

# ┌───────────── minute (0 - 59)
# │ ┌───────────── hour (0 - 23)
# │ │ ┌───────────── day of the month (1 - 31)
# │ │ │ ┌───────────── month (1 - 12)
# │ │ │ │ ┌───────────── day of the week (0 - 6) (Sunday to Saturday;
# │ │ │ │ │                                   7 is also Sunday on some systems)
# │ │ │ │ │
# │ │ │ │ │
# * * * * * <command to execute>

You can turn off temporarly some job by commenting it in crontab file or you can turn off cron service for turning off all jobs:

sudo service cron stop

If you want to call some shell script by cron, you have to add execute privilege to this script

chmod +x /path/to/script

Useful resources:

• crontab guru: The quick and simple editor for cron schedule expression
• Cron Expression Generator & Explainer - Quartz
• Jessica Yung: Automate running a script using crontab
• Create a Cron Task in Ubuntu 16.04
• Wikipedia: Cron
• Stack Exchange: How to set a cron job to run a shell script?
• Stack Exchange: Command to ON/OFF cron job

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