In this blog we are explaining the importance of Crontab in Linux. Crontab is additionally the name of the program, that is employed to edit that schedule. it’s driven by a crontab file, a config file that indicates shell commands to run sporadically for the schedule.

Why use Cronjobs?
Here the explanations for Cronjobs in Linux:

  • Helps OS to require a regular backup of log files or info.
  • Delete previous log files
  • Archive and purge info tables
  • send any notification email like Newsletters, watchword expiration email
  • Regular clean-up of cached information
  • Crontab is a perfect choice to modify operating system jobs.
  • it’s accustomed modify system maintenance

Linux Crontab format
Crontab of Linux has six fields.
The primary 5 fields outline the time and date of execution, and also the 6’th field is for command execution.

Crontab syntax:
[Minute] [hour] [Day_of_the_Month] [Month_of_the_Year] [Day_of_the_Week] [command]

20 04 15 05 * /scripts/
20 – 20th Minute
04 – 04 AM
15 – 15th Day
05 – 5th Month (may)
* – Every day of the week

Astrics (*): Use for matching
outline range: Allows you to outline a spread with the assistance of hyphen like 1-10 or 30-40 or jan-mar, mon-wed.
outline multiple ranges: Allows you to outline varied ranges with command separated like apr-jun,oct-dec.

List Crontab :-

crontab -l

List for user splunk :-

crontab -u splunk -l

For edit crontab in root :-

crontab -e

For edit crontab in splunk user :-

crontab -u splunk -e

To remove your crontab tasks, use the subsequent command :-

crontab -r

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