crontab monthly

Objective This two weeks learned a lot of things, but also the Golang language basic grasp, the harvest is quite a lot. In the process of doing security, there are many tasks that need to be performed regularly, such as the number of crawl hosts, port data, and so on, which can not escape the Linux crontab command, today to share a little bit of crontab this small knowledge point. Remind everyone, in the la

In AIX and Linux, crontab introduces similar crontab usage in AIX and Linux. First, it introduces Crontab usage in Linux, and then introduces differences between AIX and Linux. 1. Crontab the crontab command is used to schedule the execution of some commands at a certain int

1. Introduction to crontab The crontab command schedules the execution of some commands at certain intervals. 1.1/etc/crontab file 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

http://www.jb51.net/LINUXjishu/151805.htmlIf we need to perform periodic repetitive tasks on a regular basis, we will use the Timed task function to help us automate recurring recurring tasks such as daily, weekly and so on, without the need for human intervention. Method/Step1, we use crontab–e to create their own scheduled tasks# CRONTAB-EEnter the timer task command in the

file and use crontab file to set the time table.InstanceRun the Command/bin/ls once every 0th minutes of every hour every month.0 7 ***/bin/lsDuring October 11, December, the/usr/bin/backup task is executed every 20 minutes from to every day.0 6-12/3*12 */usr/bin/backupFrom Monday to Friday, send a letter to alex@domain.name at every day0 17 ** 1-5 mail-s "hi" alex@domain.name Execute echo "haha" at midnight, 00:20, and 02:20 ever

restarted every 30 minutes from 18:00 to 23:00 every day. 0 * * 6/USR/LOCAL/ETC/RC.D/LIGHTTPD Restart the above example indicates that each Saturday's 11:00am restarts lighttpd. * */1 * * */usr/local/etc/rc.d/lighttpd restart every hour restart lighttpd* 23-7/1 * */usr/local/etc/rc.d/lighttpd restart 11 o'clock to 7 in the morning. Between, every hour restarts lighttpd0 4 * mon-wed/usr/local/etc/rc.d/lighttpd Restart monthly 4th and 11 points per Mon

referring to month, the command is executed monthly (subject to other restrictions ).The hyphen (-) between integers denotes an integer sequence , for example 1-4 means integers 1,2,3,4The specified value is separated by commas. Such as: 3,4,6,8 represents these four specified integers.the symbol "/" specifies the stepping setting. "/A comment line that begins with "#" is not executed. If a cron task needs to be performed on a regular basis instead o

1. Introduction to CrontabThe crontab command schedules the execution of some commands at certain intervals.1.1/etc/Crontab fileThere 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 (in the/var/spool/cron di

In the crontab file created by the user, each line represents a task, each field of each row represents a setting, its format is divided into six fields, the first five is the time setting segment, and the sixth paragraph is the command segment to execute, in the following format:Minute hour day Month Week commandwhichMinute: Represents minutes, which can be any integer from 0 to 59.Hour: Represents the hour, which can be any integer from 0 to 23.Day:

On the Linux platform, you can write a Cron script to implement the task scheduling function. Execute tasks at a certain frequencyBy default, the crond process is started in Linux. The crond process does not need to be started or closed. The crond process reads and executes scheduling tasks. You only need to write the corresponding scheduling script to the cron scheduling configuration file. Cron scheduling files include the following: Crontab Cron

scheduling:Detailed system-level scheduling can be found here.Here you need to emphasize several cron-related directories and files in the/etx directory, as shown below CRON.D: directory, in which all files conforming to the schedule syntax in this directory and in subdirectories are executed Cron.deny and Cron.allow: This file records the rejected and allowed to execute the account number, Cron.allow priority is greater than Cron.deny, it is generally recommended to leave only one

Cron is a built-in service for Linux. You have the following command to start, view, and close this service. Service cron start// start service cron stop //Shutdown Services service cron Restart //Restart service cron Reload // Reload Configuration service cron status//View services statusCron Global configuration file in/etc directory:cron.d/System Automatic recurring tasks cron.daily/tasks performed once a day cron.hourly/tasks performed once per hour cron.m

crontab scheduled execution task crontab-e When you enter the crontab Task Command, the default editor of crontab may be different. As shown in, the nano editor is easy to use. Simply press the crontab command format at the end of the file, press Ctrl + x to exit, and pres

system task scheduling.The Crond process not only reads all the files in/var/spool/cron every minute, but also reads/etc/crontab, so we can configure this file to perform tasks on a regular basis. The crontab configuration is for a user, and editing/etc/crontab is a task for the system. The file format for this file is: Shell=/bin/bashPath=/sbin:/bin:/usr/sbin:

/var/log/cron File Save Cron task execution recordCD/var/log/-L cron*Will find a cron log change every day.UseTail-f CronAbility to view logs for today's cron:UseCat/etc/crontabCan seeMailto=root means that when a crontab command or task is executed, a record message is generated to the root userView Root's Mail[[Email protected] cron]# CD/var/spool/mail[[email protected] mail]# pwd/var/spool/ Mail[[email protected] mail]# Lsdee Emperor mysql root

times. Just use a comma (,) to separate the required values. Let's continue with the previous example. Now, if I want to execute the command at 2:30 P.M., what I need to do is:02,14 1 * */usr/bin/backup30:30 min02,14:2 am and 2 PM1: The first day*: Every month*: Every day of the weekNote: We have used 14 to specify 2 o'clock in the afternoon because Crontab uses a 24-hour time format.Furthermore, crontab c

this account as an emailhome=///user-run path, here is the root directory# Run-parts* * * * * root run-parts/etc/cron.hourly//hourly execution of scripts within/etc/cron.hourly4 * * * Root run-parts/etc/cron.daily//daily execution of scripts within/etc/cron.daily4 * * 0 root run-parts/etc/cron.weekly//weekly execution of scripts within/etc/cron.weekly4 1 * * Root run-parts/etc/cron.monthly//monthly to execute scripts within/etc/cron.monthlyAttention

Restart the above example indicates that Apache is restarted every 30 minutes between 18:00 and 23:00 every day. 0 * * * * 6/USR/LOCAL/ETC/RC.D/LIGHTTPD Restart the above example indicates that the 11:00 PM restarts Apache every Saturday. /1 * */USR/LOCAL/ETC/RC.D/LIGHTTPD restart restart Apache every hour 23-7/1 * * * * * * */usr/local/etc/rc.d/lighttpd restart 11 o'clock to the morning 7, restart Apache every hour. 0 4 * mon-wed/usr/local/etc/rc.d/lighttpd Restart

the crontab Task Command, the default editor of crontab may be different. As shown in, the nano editor is easy to use. Simply press the crontab command format at the end of the file, press Ctrl + x to exit, and press y to save. In the vi Editor, press the I key, press the crontab command format at the end of the

This was a friend's "100,000-month-a-month" problem, and I asked him, "Are you looking at this as an employee or as a boss?"Friends do not understand what I mean, do not blame him, the early years I will not understand the meaning of this sentence.01Just at work, I looked at the North Canton dozen friends pay is often 10,000, just beginning to talk about each other's monthly income, after two years have become a chat annual salary.It seems that in add