the.com/cron
the robot that never forgets to run your script, even when you would.
means a time-based job scheduler on unix-like systems that executes commands automatically at specified times or intervals.
from named from the greek chronos, meaning time; created by brian kernighan for unix at bell labs in the late 1970s.
syntax crypticfive fields of asterisks scare beginners forever
crontab filestores each user's personal schedule of jobs
daemon runsquietly checks the clock every single minute
typo riskone wrong asterisk means midnight becomes noon