2018-04-19 "Bird Brother's Linux private cuisine Basic Study (Fourth Edition)" chapter 15th routine work schedule notes

The third edition of Chapter 15 in the fourth edition of the PDF, and then all in the fourth version of the PDF to see. Fourth and third editions are not the same, starting with the fourth edition of notes from this day

At
The new process is in the/var/spool/at/directory
/etc/at.allow
/etc/at.deny

Cron (Crond) system
crontab command
/var/spool/cron/"$ user Name" process file
/etc/crontab System Process files
/usr/bin/crontab execution file for crontab command
/etc/cron.allow users who are not in this file are not allowed to use crontab naming
/etc/cron.deny users in this file are not allowed to use crontab naming

Anacron command
/etc/cron.hourly/0anacron Update Time stamp
/etc/anacrontab

2018-04-19 "Bird Brother's Linux private cuisine Basic Study (Fourth Edition)" chapter 15th routine work schedule notes