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crontab

More info: man 4 crontabs

user crontab

  • Edit: crontab -e
  • Save: crontab -l > my-crontab.txt
  • Load: crontab my-crontab.txt

example crontab

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root

# Disable email on output
# MAILTO=""

# For details see man 4 crontabs

# Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  * user-name  command to be executed

# Every 20 mins:
*/20 *  *  *  *  /usr/bin/echo "foo" > /dev/null