How can I run command every six hours every day?
I tried the following, but it did not work:
/6 * * * * * mycommand
You forgot a *, and you've too many fields. It's the hour you need to care about
0 */6 * * * /path/to/mycommand
This means every sixth hour starting from 0, i.e. at hour 0, 6, 12 and 18 which you could write as
0 0,6,12,18 * * * /path/to/mycommand
You should include a path to your command, since cron runs with an extensively cut-down environment. You won't have all the environment variables you have in your interactive shell session.
It's a good idea to specify an absolute path to your script/binary, or define PATH in the crontab itself. To help debug any issues I would also redirect stdout/err to a log file.
export variable=something I get to still use them inside that same script? and I use date command alot inside the script
0 */6 * * * command
This will be the perfect way to say 6 hours a day.
Your command puts in for six minutes!
Please keep attention at this syntax:
* */6 * * *
This means 60 times (every minute) every 6 hours,
not
one time every 6 hours.
0 */6 * * *
crontab every 6 hours is a commonly used cron schedule.
You need to use *
0 */6 * * * /path/to/mycommand
Also you can refer to https://crontab.guru/ which will help you in scheduling better...
Try:
0 */6 * * * command
. * has to
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15 15,23,05,11 * * * /path/to/mycommand?0 15,21,3,9 * * *)