What is the use of crontab command in Linux Operating system?

Crontab is a very useful command used for scheduling purpose. If a person working inn Linux operating system wishes to schedule to run later they can achieve this by using the crontab command. Thus it is possible that each user working in the Linux operating system can define their own crontab. There are many options available with this crontab command. Some of them are namely:


Crontab with –u option is used for specifying a username.

If this –u option is not specified then the user whoever is executing the command would be taken for crontab.


Crontab with –l option is used to list the entries of current crontab


Crontab with –r option is used to remove the current crontab.

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Kanhaiya

  • Dec 11th, 2006
 

Using crontab we can run offline processes on specified period of time. i.e if i want to run a shell script after a certain interval we can make that entry and specify the in crontab file.

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Bhagavan Reddy

  • Apr 19th, 2007
 


Hi,

Please explain clealy crontab command.
And i want to run one shell script every 3 hours, and it should start 1 A.M and end should be 10 P.M.

How to use crontab command for above requirement...

Regards
Bhagavan Reddy.

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vdeshpande

  • Oct 29th, 2007
 

crontab will keep ur jobs ongoing even when u are away

crontab *****  each star has its own meanin
 hors days month year  dayof the month

plz check more on this topic @linux userforums

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