How to use cron scheduler

Every user as well as administrator of the linux system very often needs to execute some programs on regular basis. For example administrator needs to monitor a disk usage of a system. In this case cron scheduler is very handy tool to achieve this. For example if root needs to execute /usr/local/sbin/backup.sh script every Sunday at 2:36AM he would edit his crontab file as shown on the figure below:

# crontab -e

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