crontab command

Basic format: * * * * command Time-sharing and Lunar Week command The 1th column represents minutes 1~59 per minute with * or */1 The 2nd column represents the hour 1~23 (0 for 0 points) The 3rd column represents the date 1~31 The 4th column represents the month 1~12 The 5th list of the week 0~6 (0 for Sunday) 6th column the command to run Some examples of

Run the yum command in CentOS to install the crontab program of the scheduler.Overview With the "Task Scheduler", you can schedule any script, program, or document to run at a very convenient time. In general, it is to regularly execute a script or program.Common usage Timed ShutdownRegular check for updatesRegularly back up system configurations, databases, and logsRegular cleanup of junk filesCheck whethe

A feature commonly used in Scheduled tasks, detailed below: Start and stop of services The cron service is a built-in service for Linux, but it does not boot automatically. You can start and stop a service with the following command: Linux Code /sbin/service Crond Start/sbin/service Crond Stop/sbin/service Crond Restart/sbin/service Crond Reload The above 1-4 lines are start, stop, restart service, and reload the configuration respectively. To s

The crontab command schedules the execution of some commands at certain intervals. These commands are usually stored in the crontab file, which is different from the command file of the at command. In the AT command, the

Basic Format: * *** Command Hour, day, month, and week commands The 1st column indicates minute 1 ~ 59. Each minute is represented by * or */1. The first column indicates the hour 1 ~ 23 (0 indicates 0 points) The 3rd column indicates the date 1 ~ 31 The 4th column indicates the month 1 ~ 12 The Identification Number of column 5th is from day of the week to day ~ 6 (0 indicates Sunday) 6th columns of commands to run Some examples of

Execute */5 every five minutes * * * *Executes 0 per hour * * * *Executes 0 0 * * * per dayWeekly Execution 0 0 * 0Monthly execution 0 0 1 * *Annual Execution 0 0 1 1 *For detailed usage, refer to this blog post http://yangqijun.iteye.com/blog/11730161. RoleUse the crontab command to modify the crontab configuration file, and then the configuration is performed b

Linux crontab Command Format and example Linux crontab Command Format and example Run */5 * every five minutes **** 0 *** per hour **** Execute 0 0 every day *** Execute 0 0 every week ** 0 0 0 1 per month ** Execute 0 0 1 1 * every year * For detailed usage, refer 1. RoleYou can use the

First, Introduction1, Linux has many recurring tasks, these tasks are completed by the cron daemon, so cron This system service is started by default.2, Linux scheduling tasks are divided into two categories: System task scheduling and user task scheduling, System task scheduling is the system periodic work to be performed. The/etc/crontab file is a configuration file for system task scheduling.3, user task scheduling is the user to perform periodic w

The crontab command schedules the execution of some commands at certain intervals. There is a crontab file in the/etc directory, which stores some scheduling tasks that are running systematically. Program . Each user can create their own scheduling crontab. The crontab

The crontab command schedules the execution of some commands at certain intervals. There is a crontab file in the/etc directory, which stores some scheduling programs that are running systematically. Each user can create their own scheduling crontab. The crontab