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To run a cron job weekly, you can use the following format in your crontab file:
0 0 * * 0 /path/to/command
This cron job will run at midnight (0 hour and 0 minute) on Sunday (day 0). Replace /path/to/command
with the command you want to run.
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Here's a breakdown of the format:
0
represents the minute (0-59)0
represents the hour (0-23)*
s**** in the third and fourth positions represent the day of the month and the month (respectively). Using *
means**** the job will run every day of the month and every month.0
in the fifth position represents the day of the week, with 0 representing Sunday, 1 representing Monday, and so on.So the cron job in the above format will run every Sunday at midnight.
One of the neat features of Cron is the ability to send emails when an error occurs during the execution of the cronjob. This can be done using the `MAILTO` environmental variable. When executing cronjob, any output is mailed to the owner of the crontab or to the user or email address specified in the `MAILTO` environment variable in the crontab, if such exists.
By default, cron checks crontabs for cronjobs every minute. If you want to run a job every n seconds you need to use a simple workaround.
Cron can generate logs, which are very useful in troubleshooting your cron jobs. In this quick tutorial, we will take a look at cron logs – how to find them and how to read them.
Every minute cron goes through all the crontabs and looks for the jobs that should be executed. The exact time of the execution can be specified using the cron syntax. Whenever the parameter matches the current date and time cron job is executed.
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