How do CentOS7 perform PHP timed task detail

preface

This article mainly introduces the CentOS7 to perform PHP timing task related content, sharing for your reference and study, the following words do not say much, let's have a look at the detailed introduction

CentOS 7 Installation crontab:

yum install crontabs

Grammar:

crontab [-u < The user name > ][configuration file] or crontab [-ES18en] < The user name > ][-elr]

Parameters:

-ES26en edits the timer Settings for this user. -ES27en lists the timer Settings for this user. -r removes the user's timer Settings. -u < The user name > Specifies the name of the user to set the timer.

The use of more about Crontab command method can refer to this article: https: / / www ofstack. com article / 148575. htm

1, in the command line input:

crontab -e

Then add the corresponding task, wq disk exit;

2. Find the php execution directory:

which php

3. Execute the script format

* * * * * /usr/local/php/bin/php /var/www/aaa.php

4. Service status

systemctl start crond.service
systemctl stop crond.service
systemctl restart crond.service
systemctl reload crond.service
systemctl enable crond.service ## Set up the cron Powered up 
crontab -l ## View the current cron
crontab -e ## Edit the current cron
crontab -r ## Delete the current cron

2. Practical examples

Parameters that

Minute: The minute of each hour to perform this task, value range 0-59; Hour: The number of hours per day to perform this task, value range 0-23; Day: Perform this task on the first day of each month, with values ranging from 1 to 31; Month: The month of the year to perform this task, the value range is 1-12; DayOfWeek: Perform this task on the first day of the week, and the value range is 0-6, 0 means weekend; CommandPath: Specifies the program path to execute;

30 21 * * * /etc/init.d/nginx restart  ## Every night, 21:30 restart  nginx . 
45 4 1,10,22 * * /etc/init.d/nginx restart ## A month 1 ,  10 , 22 Day, 4 : 45 restart nginx . 
10 1 * * 6,0 /etc/init.d/nginx restart  ## Once a week 6.  Sunday's 1 : 10 restart nginx . 
0,30 18-23 * * * /etc/init.d/nginx restart ## Every day, 18 : 00 to 23 : 00 Between every 30 Minutes to restart nginx . 
0 23 * * 6 /etc/init.d/nginx restart  ## Every week 6 the 11 : 00 pm restart nginx . 
* */1 * * * /etc/init.d/nginx restart  ## every 1 Hours to restart nginx
* 23-7/1 * * * /etc/init.d/nginx restart  ## evening 11 Point to the morning 7 Between the dots, each   every 1 Hours to restart nginx
0 11 4 * mon-wed /etc/init.d/nginx restart ## The monthly 4 With the weekly 1 To the week 3  the 11 Point to restart nginx
0 4 1 jan * /etc/init.d/nginx restart  ##1 month 1 The no. 4 Point to restart nginx
*/30 * * * * /usr/sbin/ntpdate 210.72.145.20 ## Synchronize every half an hour 1 Next time 

conclusion