Linux Crontab timed tasks

CRONTAB Introduction * * * *
In short, crontab is a custom timer.

Crontab configuration File * * * *

• One/var/spool/cron/
  This directory contains crontab tasks for each user (including root), named after the user name
• Second:/etc/cron.d/
  This directory is used to store any crontab files or scripts to be executed.

Crontab Time Description * * * *

# .---------------- 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 # |  |  |  |  |# *  *  *  *  *  command to be executed

Minute: Represents the first part of an hour in the range 0-59.
Hour: Represents the first hour of the day, Range 0-23.
Mday: Represents the day of the one month, the range 1-31.
Month: Represents the month ordinal of a year, with a range of 1-12.
Wday: Represents the day of the week, and the range 0-7 (0 and 7 are Sunday).
Who: To use what identity to execute the directive, when you use CRONTAB-E, you do not have to add this field.
Command: The command to execute.

Crontab Service Status * * * *

sudo service crond start     #启动服务sudo service crond stop      #关闭服务sudo service crond restart   #重启服务sudo service crond reload    #重新载入配置sudo service crond status    #查看服务状态

crontab Command * * * *
Reassign crontab scheduled Task List files

crontab $filepath

View Crontab Scheduled Tasks

crontab -l

Edit timed Task Delete-add-Modify

crontab -e

Alicfeng
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Linux Crontab Scheduled Tasks