cron twits

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

There are 2 types of cron expressions:Seconds Minutes Hours dayofmonth Month DayofWeek year orSeconds Minutes Hours dayofmonth Month DayofWeekTime of day and month of moonSpecial characters allowed for field allowed valuesSeconds 0-59,-*/Sub 0-59,-*/Hours 0-23,-*/Date 1-31,-*? /L W CMonth 1-12 or JAN-DEC,-*/Week 1-7 or Sun-sat,-*? /L C #Year (optional) leave blank, 1970-2099,-*/0 0 * * *? Daily hourly executionhttp://blog.csdn.net/error_case/article/d

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

Let's see the interface! Cron. mxml: Extendscheckbox.: package com.gzhdi.backup.cron{import spark.components.CheckBox;public class ExtendsCheckBox extends CheckBox{private var _value:String;public function ExtendsCheckBox(){super();}public function get value():String{return _value;}public function set value(value:String):void{_value = value;}}}

,$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

example: "0/15" in sub-expressions (minutes) means starting from the No. 0 minute, every 15 minutes"3/20" in the sub-expression (minutes) means that every 20 minutes (it is the same as "3,23,43") starting from the 3rd minute“？ "Character is used only for days (months) and days (weeks) of two sub-expressions, indicating that no value is specifiedWhen one of the 2 sub-expressions is assigned a value, in order to avoid a conflict, you need to set the value of another subexpression to "? ”The "L" c

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

The previous two is a simple trigger (Simpletrigger), Simpletrigger can only handle simple events, if you want to be flexible to trigger the task, you need to Crontrigger this important person. Crontrigger is also one of the most important features of quartz, by quartz specific cron expression to determine a certain kind of time, can complete similar "November 11, 2011 (God Stick Day, has passed), each Wednesday xxx" complex timing tasks. Code or old