How to Schedule Tasks with cron

What this is

cron is a scheduler that runs commands automatically at specific times.

What it is for

• Automated backups
• Cleanup tasks
• Periodic scripts

Prerequisites

• SSH access
• A command or script you want to schedule

Step-by-step

Step 1) Edit your user crontab

crontab -e

Step 2) Add a cron line (example: every day at 2:30 AM)

30 2 * * * /usr/bin/bash /home/USERNAME/scripts/backup.sh >> /home/USERNAME/logs/backup.log 2>&1

What it does: Runs the script and appends output to a log.

Step 3) Verify cron syntax (basic)

• Minute (0-59)
• Hour (0-23)
• Day of month (1-31)
• Month (1-12)
• Day of week (0-7, Sunday)

Step 4) Test your script manually first

/usr/bin/bash /home/USERNAME/scripts/backup.sh

Warnings & notes

• Cron runs with a minimal environment. Always use full paths.
• Log output to debug problems.

Final verification

crontab -l
ls -la /home/USERNAME/logs/backup.log

Conclusion

cron lets you automate maintenance reliably. Start simple, log output, and verify results.