Scheduled Tasks Linux Cron Job Preliminary use

The command to view a timed task is: crontab-l the command to edit a timed task is: CRONTAB-E (effective immediately after editing if comments can be added at the beginning of the line with # and VI) Timed task description each action a task

Each line is divided into six sections, each separated by a space and separated by commas.

Minute hour day_of_month month weekday command

Using * in the first five fields means all points in time

minute:0-59

Hour:0-23,0 stands for 0 points

Day_of_month:1-31

Month:1-12

weekday:0-6,0 stands for Sunday, 1-6 for Monday to Saturday

Command: Scripts or commands that need to be executed

Example:

1. * * * * */home/habao/test_cron.sh per minute

2. */2 * * * * echo "I am crontab" >>/home/zhang/hello

In two minutes, I'm going to write I am crontab in the hello file.

Note: Echo needs to write full path/bin/echo or execute alias echo= "/bin/echo"

/sbin/service Crond Start//Startup service

/sbin/service Crond stop//Shut down service

/sbin/service crond Restart//Restart service

/sbin/service Crond Reload//Reload Configuration

Reference: http://www.xshell.net/linux/crontab-3.html

Http://www.2cto.com/os/201109/105474.html

Scheduled Tasks Linux Cron Job Preliminary use