UNIX for Dummies Questions & Answers

How to make a script run automatically using a cron??

i do not know abt cron......

if i have simple.sh file and i need this to run everyday at a particular time what needs to be done


thanks in advance

See this link: https://www.unix.com/answers-to-frequently-asked-questions/13527-cron-crontab.html

You can edit your own cron table with 'crontab -e'.

For information on the contents of your cron table, see 'man 5 crontab'. If you do not have this manpage, see here.

u can do it either the crontab way or just add pur ur .sh file in rc.d folder under /
then ur .sh file will be processed every time ur system boots up..

Cron Jobs Usage
=================================================

1. Create a Script that you want to run as a CronJob

2. Assign the Script for the CRONTAB
(CRONTAB would be differ from each user. So if you want to create
a tab for the other user log-on as that user)
crontab -e ==> Command to edit the crontab
-e (edit user's crontab)
-l (list user's crontab)
-r (delete user's crontab)

3. Crontab Syntax:
crontab [ -u user ] file

<MIN> <HOUR> <DAY_OF_WEEK> <MONTH> <YEAR> <SCRIPT_NAME>

4. Examples

30 9-17 * 1 sun,wed,sat echo `date` >> /date.file 2>&1
At half past the hour, between 9 AM and 5 PM, for every day of January
which is Sunday, Wednesday or Saturday, append date to file date.file

0 23-7/2,8 * * * date
Every two hours from 11p.m. to 7a.m., and at 8a.m.

0 4 1 jan * date
4:00 a.m. on january 1st

To take the physical database backup every day:
15 23 * * * /home/z755692/scripts/makeDbBackup.sh >> /tmp/DBBACKUP/bkup.log


Reference:
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http://www.pantz.org/os/linux/programs/cron.shtml