crontab command

In the Linux server deployment timing tasks, often use crontab, mainly for the execution of Web site timing scripts, system maintenance, backup timing tasks, this article describes crontab deployment tasks and commands The Linux system uses crontab to run scheduled tasks, which are timed tasks, and the basic syntax format is: 2 */1 * * */data/vhosts/example/cro

Use of DISPATCH commands General Command execution [Email protected]/]# date >>/home/mydate.txt#--------------------------- View effects---------------------------------[[email protected]/]# Cat/home/mydate.txtmon 07:04:56 EDT 20152. Execution of DISPATCH commands[[email protected]/]# Crontab-eno crontab for root-using an empty one* * * * * Date >>/

Use the crontab command Name: crontabPermission: All UsersUsage:Crontab [-u user] FileCrontab [-u user] {-L |-r |-e}Note:Crontab is used to allow users to execute programs at a fixed time or interval. In other words, it is similar to the user's time table. -U user is used to set the time table of the specified user. The premise is that you must have the permission (for example, root) to specify the

The Linux system is controlled by the cron (Crond) system service. Linux systems have a lot of planned work on them, so this system service is started by default. In addition, because the user can set up scheduled tasks themselves, the Linux system also provides a command for the user to control scheduled tasks: the crontab command.Crond IntroductionCrond is a daemon that is used to periodically perform cer

Add the scheduled Task Command crontab-e in CentOSRestart teamviewer every two hours to prevent external connection to the console and execute: crontab-e // enter the timer editing page. Add the following command: control + c! Wq save 0 */2 *** teamviewer deamon restart0 */2 *** echo "Have a break now. ">/tmp/test.txt

Linux Command configuration scp + crontab + mail, scpcrontab Remote replication:Example: log on to server A and copy all the files under/sh of server A to the/sh folder of server 172.18.100.200. Scp/sh/* root@172.18.100.200:/sh # Need to know the password of 172.18.100.200 Batch kill Processes:Example: many processes need to be killed in ps-ef | grep Download/popUnlink.Root 28300 28297 16 00:14:22 pts/1 php

.... Perform echo "haha"0-23/2 * * * echo "haha"Attention:When the program is executed at the time you specify, the system will send you a letter showing what the program is doing, and if you do not wish to receive such a letter, please leave a blank in each lineAfter adding >/dev/null 2>1 can beExample 2:#每天早上6点10分6 * * * Date#每两个小时0 */2 * * * Date#晚上11点到早上8点之间每两个小时, 8 in the morning.0 23-7/2,8 * * * Date#每个月的4号和每个礼拜的礼拜一到礼拜三的早上11点0 4 * mon-wed date#1月份日早上4点0 4 1 Jan * DateExample$

Though that's what the internet says, ======================================= Log on to the command line as root Input CRONTAB-E Press the A key to enter edit mode Input 0 */1 * * */home/work/start-service.sh Press CTRL + C to exit edit mode at the same time Press shift+: Enter WQ exit crontab =======================================but has been unsucc

Basic format:* * * * * commandTime-sharing Weekly commandThe 1th column represents minutes 1~59 per minute with * or */1The 2nd column represents the hour 1~23 (0 means 0 points)The 3rd column represents the date 1~31The 4th column represents the month 1~125th Column Identification Number Week 0~6 (0 = Sunday)6th List of commands to executeSome examples of crontab files:* * * * */usr/local/etc/rc.d/lighttpd restartThe example above represents a 21:30

Today development says that there is a server Crontab task execution exception. The same account to run the command manually to execute the command correctly. It felt like I was having a supernatural event. Take a closer look after dinner. The crontab to be executed is first redirected to the file. * * * * * xxxx x

1th column min 1~592nd Hour 1~23 (0 = midnight)3rd Liege 1~314th Column Month 1~125th Column Week 0~6 (0 = Sunday)6th List of commands to runHere is the format for crontab:Time-sharing day and month command to runHere are some examples of crontab file entries:21:30 restart Apache per night:* * * * */usr/local/apache/bin/apachectl restart4:45 restarts Apache on 1, 10, 22nd of each month:4 1,10,22 * */usr/loc

, every small implementation of "IP addr Show" command;[Email protected] ~]# Cat/etc/crontabShell=/bin/bashPath=/sbin:/bin:/usr/sbin:/usr/binMailto=roothome=/# for details see Mans 4 Crontabs# Example of Job definition:#.----------------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# | | | |

Article from: http://www.centoscn.com/CentOS/help/2014/1030/4025.html Objective Crontab is used by UNIX and Linux to set up periodically executed instructions, is the Internet is very common technology, many tasks will be set up in the crontab loop execution, if not the use of crontab, then the task is resident program, which for your program requirements are rel

Like whatI use orders in CRONTAB-E.Echo-e "' Date ' +%s ' \t$random" >/tmp/xxxWordsDirect use of command line no problemBut when it was written in Cron,'% ' needs to be escaped into ' \% 'The reason has not been foundThe reason has finally foundLook at Crontab's help under LinuxMans 5 CrontabIn this section: Percent-signs (%) in the command,Unless escaped with b

Instructions for transferring to Cron Notes for using cron: 1. Try to write the full path of the command. Because cron does not have any user environment variables during running, you must either set the environment variables in the shell to be called or/Etc/profileSet system environment variables. But the safest way is to specify the full path of the command. If you stick to the former, remember one thin