Welcome to the tutorial on where to find crontab (cron) logs in Ubuntu and Debian. This guide will show you how to locate and view your cron activity logs, which are essential for monitoring and troubleshooting.
Location of Cron logs: On Ubuntu and Debian systems, cron activity logs are not saved in a dedicated log file. Instead, they are logged by the syslog daemon and sent to the system log file
/var/log/syslog. This file contains entries for various operating system components and can be consulted to analyze cron activities.
Access to Cron logs: To view cron-related logs in
/var/log/syslog, you can use the
grep command. Here is an example command you can run in the terminal to filter only cron-related entries:
grep CRON /var/log/syslog
Since the syslog file contains logs from different applications and modules, using
grep helps isolate only cron-specific messages. However, it is important to note that you must have superuser permissions to read the syslog file.
If you prefer to view the contents of the syslog file and then filter the cron entries, you can use the
cat command in combination with
grep, as follows:
cat /var/log/syslog | grep cron
Monitoring your cron logs is essential to ensuring that your scheduled tasks run as expected. Knowing the location of these logs and how to access them will help you keep your Ubuntu and Debian systems in good health. Remember that, for security reasons, only users with superuser privileges can access the syslog file. Good job with your cron monitoring!