cron expression

Time expression setting in quartz ----- corn expression Time Format: Example: 1. When to run every day: 2. Run at intervals of time: Summary: In addition to agreeing to set a value, the time field of the cron expression can also use some special characters to provide functions such as list, range, and wildcard: ●

Release date:Updated on: Affected Systems:Baseurl yum 3.4.3Description:--------------------------------------------------------------------------------Bugtraq id: 65119CVE (CAN) ID: CVE-2014-0022 Yum is a package manager under Fedora and RedHat linux. In Yum 3.4.3 and earlier versions, the installUpdates function of yum-cron/yum-cron.py does not properly check the return value of the sigCheckPkg function, which allows remote attackers to pass unsig

1, the meaning of each fieldSeconds 1 Seconds (0-59)Sub 2 Minutes (0-59)3 Hours (0-23)Day 4 days of month (1-31)Monthly 5 month (1-12 or JAN-DEC)Week 6 day of week (1-7 or Sun-sat)Year 7 years (1970-2099)2. Special characters"/": "1/20" means, starting from the 1th minute, every 20“？ ": Indicates a day of the month, or a day of the week"W": indicated as the most recent weekday, "15w" monthly field to the nearest working day of month 15th"#": The nth business day of the month, "6#3", means the th

About the implementation of PHP cron task management Before each development of a scheduled task function requires online operation crontab to add new items, so you want to use PHP to unify the management of task items in a single project? You can create a table [Id,name,status,func,timer,last_time,created_at] to unify the scheduled task script in the project, through a simple configuration? The ability to abstract each scheduled task into a simple ta

,$1 is source dir# and $ is destination dir. Dir= $/* des= $ # Test The destination dirctory whether exists[- D $des] Echo "Dir Exist"Exit 1 # Create The destination dirctoryMkdir$des # Set counter, it would auto increase to the number of# source file. I=0 # Count of the number of source fileN= 'Echo $/* |wc-w ' forFileinch`Echo $dir` Do # Calculate Progresspercent=$ (( -* (++i)/n)) Cat $percentCopying file$file... XXX Eof/bin/cp-r$file $des>/dev/null Done| Dialog--title"Copy"--g

. Dir= $/* des= $ # Test The destination dirctory whether exists[- D $des] Echo "Dir Exist"Exit 1 # Create The destination dirctoryMkdir$des # Set counter, it would auto increase to the number of# source file. I=0 # Count of the number of source fileN= 'Echo $/* |wc-w ' forFileinch`Echo $dir` Do # Calculate Progresspercent=$ (( -* (++i)/n)) Cat $percentCopying file$file... XXX Eof/bin/cp-r$file $des>/dev/null Done| Dialog--title"Copy"--gauge"Files" 6 -ClearEffect9.Echo outputFea

written crontab is then executed every minute, as follows: Copy Code code as follows: Crontab-e * * * * */bin/bash/home/somedir/cron-seconds.sh * * * The third method: So how do you use a scheduled task to implement it directly?The final solution is as follows, and it is validated that the script runs very stably. Copy Code code as follows: Crontab-e # # for Excuting scripts.sh every 3 seconds# #on 2014-10-15

This example describes the PHP version of the Cron Timer task executor usage, which is a very useful functional application. The specific methods are as follows: Since the server crontab can only be accurate to minutes, the starting point of the program is also minutes. This feature consists of three parts altogether: First, the configuration file: The configuration file is used to return the scheduled task file to be executed, note the use of the

Tags: 10.23 Linux Task Scheduler cron10.23 Linux Task Scheduler cronCommand parameters for Crontab-u specifies a user, without-u, refers to the current user-e indicates a task plan, similar to the use of vim-l lists the current task schedule-R Delete Task schedule10.24 Chkconfig Tools10.25 SYSTEMD Management Services10.26 Unit Introduction10.27 Target IntroductionRelationships between service, unit, and target1. A service is part of a unit2. Multiple unit together to form a target3. A target con

UnitService System ServicesTarget multiple units consisting of groupsDevice hardware devicesMount File System mount pointAutoMount Automatic mount pointPath file or pathSCOP is not an external process initiated by SYSTEMDSlice Process GroupSnapshot Systemd SnapshotSocket inter-process communication socketsSwap fileTimer TimerUnit-related instructionsSystemctl List-units lists the running unitSystemctl list-units--all list all, including failed or inactiveSystemctl list-units--all--state=inactiv

Archiving and compression of Linux:1. Space saving2. Facilitate the management of fragmented documentsTar Integrated Backup tool:-C: Create an archive-X: Release Archive-F: Specify the Archive file name-Z,-j,-j: Call the GZ, bz2, XZ format tools for processing-C: Specify the release location-P: Maintain absolute path to files within archive-TAR-ZCF backup files. tar.gz files that are backed up-TAR-JCF backup files. tar.bz2 files that are backed up-TAR-JCF backup files. tar.xz files that are back

The UNIX system provides cron and AT commands that allow the system and users to run certain programs on a regular basis without the need to manually start them. Using Cron for periodic execution of a command, in order to use it, you must edit the crontab file. The system default/etc/crontab file is: #/etc/crontab-root ' s crontab for FreeBSD # # $Id: crontab,v 1.13 1996/01/06 22:21:37 ache Exp $ # F

Shell Step by Step (4) -- Cron Echo, stepcron 6. Script scheduled task # Example of job definition:# .------------------------- minute (0 - 59)# | .--------------------- hour (0 - 23)# | | .----------------- day of month (1 - 31)# | | | .------------- month (1 - 12) # | | | | .--------- day of week (0 - 6) # | | | | |# * * * * * user-name command to be executed 7. view the UID of the cur

For more information about shell programming and cron planning tasks-Linux general technology-Linux programming and kernel, see the following. Recently, a server encountered a problem (the specific cause has not been identified. The initial diagnosis is that the php load is too high, leading to network congestion, and eventually the network crashes and cannot access the Internet. This is an out-of-the-box question. it has nothing to do with this topic

backup policy There are many ways to trigger a synchronization instruction, for example, you can put the synchronization instructions in the client system's crontab Daemon, set the sync time, and then let Linux the system triggers the synchronization instruction and completes the data backup automatically. This method of data backup can be used in business systems where data security requirements are not high. For example: set every morning 3 Point - perform a mirrored backup ofThis article i

First, homework (exercise) content:1. Summarize the detailed usage method of the task plan (at, crontab) on Linux system;answer:http://blog.51cto.com/user_index.php?action=addblog_newdid=1648072, every Monday to Saturday 3:20 A.M., run the CP command to archive the/etc/directory, storage location is/BACKUPS/ETC-YYYY-MM-DD;Answer: 3 * * 1-6/bin/cp-rf/etc/*/backup/etc-' date + $F '3, every Sunday 2:30 A.M., run the CP command to backup the/etc/fstab file, the storage location is/BACKUP/FSTAB-YYYY-

First, homework (exercise) content:1. Summarize the detailed usage method of the task plan (at, crontab) on Linux system;http://xiexiaojun.blog.51cto.com/2305291/16880682, every Monday to Saturday 3:20 A.M., run the CP command to archive the/etc/directory, storage location is/BACKUPS/ETC-YYYY-MM-DD;2 * * * 1-6/bin/cp-a/etc//backups/etc-$ (date +%f) >/dev/null3, every Sunday 2:30 A.M., run the CP command to backup the/etc/fstab file, the storage location is/BACKUP/FSTAB-YYYY-MM-DD-HH-MM-SS;2 * *

root@~:~# CRONTAB-E No crontab for root-using an empty one 888 I can't do it from the new installation. There's no way to get into edit cron Reply to discussion (solution) Ubuntu System Admin on the first-line server set up a scheduled task, accidentally selected Nano, because the previous contact is Redhat series, not accustomed to use Nano, so want to reset, online check under, seemingly no.Helpless under, re-install a server test, found t

Some functions such as timing function and certain methods can be implemented by timing task scheduling framework quartz. The following provides a simple example of implementing the quartz framework of Hello World.Importorg.quartz.CronExpression;ImportOrg.quartz.CronTrigger;ImportOrg.quartz.Job;ImportOrg.quartz.JobDetail;ImportOrg.quartz.JobExecutionContext;Importorg.quartz.JobExecutionException;ImportOrg.quartz.Scheduler;Importorg.quartz.SchedulerException;Importorg.quartz.SchedulerFactory;Impo

PackageCom.pkfare.task.manage.config;ImportOrg.quartz.spi.TriggerFiredBundle;Importorg.springframework.beans.BeansException;ImportOrg.springframework.context.ApplicationContext;ImportOrg.springframework.context.ApplicationContextAware;Importorg.springframework.context.annotation.Configuration;Importorg.springframework.scheduling.quartz.SpringBeanJobFactory;Importorg.springframework.stereotype.Component, @Configuration @component Public classJobbeanjobfactoryextendsSpringbeanjobfactoryImplementsA