Cronjob

Schedule commands to run on a repeating schedule using user's crontab file.

Cronjobların set olunması üçün cronie paketinə ehtiyac var. Həmin paketi tapmaq üçün:

sudo yum whatprovides cronie
sudo yum install cronie-noanacron.x86_64 -y

check if crond service is enabled:

systemctl enable crond.service --now
systemctl status crond.service

display helpful info about crontab:

cat /etc/crontab

---

Task 1:

Set cronjob for user natasha to do /bin/echohiya at 14:23.

Solution:

crontab -eu natasha
23 14 * * * /bin/echo hiya

# test if cronjob is created
crontab -lu natasha

Task 2:

The user natasha must configure a cron job that runs daily at 14:23 local time and also the same cron job will run after every 2 minutes and executes.

Solution:

crontab -eu natasha
23 14 * * * /bin/echo hello # add the line to the file
*/2 * * * * /bin/echo hello # every 2 minutes

systemctl restart crond.service
systemctl enable crond.service
crontab -lu natasha
tail -f /var/log/cron

Task 3:

Configure a task: plan to run echo "file" command at 14:23 every day.

Solution:

crontab -eu natasha
23 14 * * * /bin/echo "file"
crontab -lu natasha