Setting Up Cron Jobs in Ubuntu

Automating tasks on Linux is easy with cron. This guide walks you through how to schedule jobs with crontab.

1. Open the Terminal

Use Ctrl + Alt + T to open a terminal window.

2. Edit the Crontab

Run this command to open your personal crontab file:

crontab -e

This opens your user’s cron table for editing.

3. Add a Cron Job

Cron uses this syntax format:

* * * * * command_to_run

Each * represents:

1. Minute (0-59)
2. Hour (0-23)
3. Day of Month (1-31)
4. Month (1-12)
5. Day of Week (0-6, where 0 = Sunday)

Example: Run a script daily at 2 AM

0 2 * * * /path/to/script.sh

4. Save and Exit

After editing, save and exit. Cron will automatically install the new job.

5. List Scheduled Jobs

To view your current cron jobs:

crontab -l

6. View Cron Logs

To debug or confirm if your cron job ran, check the system log:

grep CRON /var/log/syslog

Or just tail it live:

tail -f /var/log/syslog

Done!

You’ve now scheduled your first cron job on Ubuntu. Automation FTW!