How to use Crontab
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How to edit your own crontab file
crontab -e
2.show current all crontabs
crontab -l
1). Everyday at 2.00 a.m
0 2 * * *
2). 3.30 p.m on the first of every month
30 15 1 * *
3). 15 minuts after mid night everyday
15 10 * * *
4). 2 p.m on week days
0 14 * * 1-5
5). Run Every 15 minuts
*/15 * * * *
6). Run every hour
0 * * * *
6). Run at every 3 hours
* */3 * * *
you can use https://crontab.guru/ to verify your cronjobs
Remove All cronjobs
crontab -r
example -> create directory at 10.30 am using bash script
10 22 * * * ./cron1.sh
cronsh1.sh bash script file --->
#!/bin/bash
mkdir testdirectory