The standard component for scheduled command execution on UNIX-like operating systems is cron. Usually the crond daemon starts at system startup. However, for various reasons, this may not happen. You can launch kronor manually or by setting up its automatic download.
Necessary
root credentials
Instructions
Step 1
Start a session with superuser rights. If a graphical shell is loaded, start a terminal emulation program and start a root session by issuing the su command. Alternatively, go to one of the text consoles by simultaneously pressing the Alt, Ctrl and F1-F12 keys and log in as root
Step 2
Check the status of the crond daemon. Run the command: service crond status If a message like crond is running was displayed, the crond is running, and you can start configuring it or adding jobs. If this message is like crond is stopped, the service has stopped, go to step 5 to start it. If the inscription service: crond: Unrecognized service is displayed, the cron will have to be installed
Step 3
Install any cron implementation from an available source (repository on the OS distribution disk, online repository of the distribution developer, etc.). Use your installed package managers like apt-get, rpm, etc. You can also download the source code of a suitable cron and build it on your machine
Step 4
Configure cron if needed. Edit the files / etc / crontab, /etc/cron.allow, /etc/cron.deny. You can read about the format for presenting information in them in the man or info documentation. If necessary (not done when installing cron), place the init script in the /etc/rc.d/init.d directory. Create links to it with the necessary names in the script directories for each boot level (usually the directories /etc/rc.d/rc1.d-/etc/rc.d/rc6.d)
Step 5
Run the crowns. Run the command: service crond start A status message will be displayed indicating the success or failure of the operation
Step 6
If necessary, create cron jobs for one or more users. Review the crontab utility by running the command: crontab --help Create a cron job file and set it with a command like: crontab -u anyuser filepath Where anyuser is the username and filepath is the path to the job file. Alternatively, use the crontab command with the -e option: crontab -u anyuser -e Launches a text editor where you can edit the list of jobs.
