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# Edit your user crontab crontab -e # List your crontab entries crontab -l # Remove your crontab crontab -r # Edit another user's crontab (root only) sudo crontab -u alice -e # ---- Crontab syntax ---- # m h dom mon dow command # | | | | | # | | | | +--- Day of week (0-7, Sun=0 or 7) # | | | +-------- Month (1-12) # | | +------------- Day of month (1-31) # | +----------------- Hour (0-23) # +-------------------- Minute (0-59) # Run every minute # * * * * * /path/to/command # Run at 2:30 AM every day # 30 2 * * * /usr/bin/backup.sh # Run every 15 minutes # */15 * * * * /usr/bin/health_check.sh # Run at 8 AM on weekdays (Mon-Fri) # 0 8 * * 1-5 /usr/bin/morning_report.sh # Run on the 1st and 15th of every month at midnight # 0 0 1,15 * * /usr/bin/billing.sh # Run every Sunday at 3 AM # 0 3 * * 0 /usr/bin/weekly_cleanup.sh # Special strings # @reboot /usr/bin/start_service.sh # @daily /usr/bin/daily_backup.sh # @weekly /usr/bin/weekly_task.sh # @monthly /usr/bin/monthly_report.sh # @hourly /usr/bin/hourly_check.sh # Redirect output (cron mails output by default) # 30 2 * * * /usr/bin/backup.sh >> /var/log/backup.log 2>&1 # Set PATH inside crontab # PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
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