crontab cheat sheet

# Thanks to Corey Schafer on Youtube
# ┌───────────── minute (0 - 59)
# │ ┌───────────── hour (0 - 23)
# │ │ ┌───────────── day of month (1 - 31)
# │ │ │ ┌───────────── month (1 - 12)
# │ │ │ │ ┌───────────── day of week (0 - 6) (Sunday to Saturday;
# │ │ │ │ │                                       7 is also Sunday on some systems)
# │ │ │ │ │
# │ │ │ │ │
# * * * * *  command_to_execute

# Every Monday at 10:30:
30 10 * * 1 echo "Hello" >> /tmp/test.txt

# On quarter past and quarter to every hour:
15,45 * * * * echo "Hello" >> /tmp/test.txt

# Every 10 minutes:
*/10 * * * * echo "Hello" >> /tmp/test.txt

# Every 3 days at midnight:
0 0 */3 * * echo "Hello" >> /tmp/test.txt

# Every hour from 5 to 10 am:
0 5-10 * * * echo "Hello" /tmp/test.txt

# Every 30 minutes during business hours:
*/30 9-17 * * 1-5 echo "Hello" /tmp/test.txt