crontab | 易学教程

How to redirect cron job output to stdout

阅读更多关于 How to redirect cron job output to stdout

问题 I have a cron job and its output is now redirected into a file. It looks like the following 0 9 * * * /bin/sh /bin/cleanup.sh > /home/darkknight/cleanup.log Can any one help me to rediect its output to stdout? 回答1: Enter tty on any terminal and we will get device file for that particular teminal window like /dev/pts/1 . Redirct the cron job into this file as cleanup.sh > /dev/pts/1 回答2: Running process has a PID and its fd (file descriptor) is mapping to /proc/<PID>/fd . And we can find PID

Run CRON job everyday at specific time

阅读更多关于 Run CRON job everyday at specific time

问题 Right now i am running my cron job everyday at 3.00PM 0 15 * * * But I want to run my cron job twice in a day. 10.30AM and 2.30PM 0 30 10 * * * I believe this command will run at 10.30AM. How should i run it in 2.30PM? 回答1: Cron utility is an effective way to schedule a routine background job at a specific time and/or day on an on-going basis. Linux Crontab Format MIN HOUR DOM MON DOW CMD Example :: Scheduling a Job For a Specific Time The basic usage of cron is to execute a job in a specific

Run CRON job everyday at specific time

阅读更多关于 Run CRON job everyday at specific time

Linux时间同步设置（转）

阅读更多关于 Linux时间同步设置（转）

1.首先需了解linux内一任务计划工具crontab crontab可以定时去执行你要做的动作直接用crontab命令编辑 crontab -u //设定某个用户的cron服务，一般root用户在执行这个命令的时候需要此参数 crontab -l //列出某个用户cron服务的详细内容 crontab -r //删除某个用户的cron服务 crontab -e //编辑某个用户的cron服务一般使用crontab -e来编辑一个计划动作，编辑模式同vi编辑器相同 crontab内的基本编辑格式如下 *　　*　　*　　*　　*　　command 分　时　日　月　周　命令第1列表示分钟1～59 每分钟用*或者 */1表示第2列表示小时1～23（0表示0点）第3列表示日期1～31 第4列表示月份1～12 第5列标识号星期0～6（0表示星期天）第6列要运行的命令 crontab文件的一些例子： 30 21 * * * /etc/init.d/smb restart 上面的例子表示每晚的21:30重启smb 。 45 4 1,10,22 * * /etc/init.d/smb restart 上面的例子表示每月1、10、22日的4 : 45重启smb 。 10 1 [...] 来源： https://www.cnblogs.com/99f2e/archive/2011

run selenium with crontab (python)

阅读更多关于 run selenium with crontab (python)

问题 I have a python script that calls chrome via selenium with the next line. ff = webdriver.Chrome('/home/user01/webScraping/CollectAndGo/chromedriver') The python script is called from a shell script. python /home/user01/webScraping/CollectAndGo/cgcom.py > /home/user01/webScraping/CollectAndGo/cgcom.log 2>&1 When I run the script from the terminal or just executing the .sh file it works perfectly but when I schedule a crontab job it fail with the next error. raise exception_class(message,

How to run Cronjobs more often than once per minute?

阅读更多关于 How to run Cronjobs more often than once per minute?

问题 I created a Email-Queue database table. I will insert all Emails my PHP application needs to send into this table. Another PHP script will then look for all unsent Emails and sends them. I run this script using cronjobs. Unfortunately cronjobs can run only at a maximum of once per minute. So in the worst-case a user has to wait one minute until his Email is really going to be sent. My current idea for a workaround is calling the script with an addtional sleep parameter and duplicating the

Golang: Implementing a cron / executing tasks at a specific time

阅读更多关于 Golang: Implementing a cron / executing tasks at a specific time

问题 I have been looking around for examples on how to implement a function that allows you to execute tasks at a certain time in Go, but I couldn't find anything. I implemented one myself and I am sharing it in the answers, so other people can have a reference for their own implementation. 回答1: This is a general implementation, which lets you set: interval period hour to tick minute to tick second to tick UPDATED: (the memory leak was fixed) import ( "fmt" "time" ) const INTERVAL_PERIOD time

How to run a cron job inside a docker container

阅读更多关于 How to run a cron job inside a docker container

问题 I tried to run a cron job inside a docker container but nothing works for me my container have only cron.daily and cron.weekly file crontab,cron.d,cron.hourly ... are absent in my container crontab -e also not working my container runs with /bin/bash 回答1: Here is how I run one of my cron containers. Dockerfile: FROM alpine:3.3 ADD crontab.txt /crontab.txt ADD script.sh /script.sh COPY entry.sh /entry.sh RUN chmod 755 /script.sh /entry.sh RUN /usr/bin/crontab /crontab.txt CMD ["/entry.sh"]

Linux Crontab 定时任务

阅读更多关于 Linux Crontab 定时任务

cron是一个linux下的定时执行工具，可以在无需人工干预的情况下运行作业。由于Cron 是Linux的内置服务，但它不自动起来，可以用以下的方法启动、关闭这个服务： /sbin/service crond start //启动服务/sbin/service crond stop //关闭服务/sbin/service crond restart //重启服务/sbin/service crond reload //重新载入配置你也可以将这个服务在系统启动的时候自动启动：　　在 /etc/rc.d/rc.local 这个脚本的末尾加上： /sbin/service crond start crontab 命令 crontab file [-u user] //用指定的文件替代目前的crontab。 crontab -u[user] //指定要设定计时器的用户名称. crontab -l[user] //列出该用户的计时器设置 crontab -e[user] //编辑该用户的计时器设置 crontab -r[user] //删除该用户的计时器设置。 crontab -c dir //指定crontab的目录。如：root查看自己的cron设置：crontab -u root -l root删除fred的cron设置：crontab -u fred -r 第一个命令行中

Centos7.3 Crontab安装使用

阅读更多关于 Centos7.3 Crontab安装使用

Linux Crontab 安装使用详细说明 crontab 命令常见于Unix和Linux的操作系统之中，用于设置周期性被执行的指令。该命令从标准输入设备读取指令，并将其存放于“crontab”文件中，以供之后读取和执行。通常，crontab储存的指令被守护进程激活。crond 常常在后台运行，每一分钟检查是否有预定的作业需要执行。这类作业一般称为cron jobs。一、安装 [root@CentOS ~]# yum -y install vixie-cron [root@CentOS ~]# yum -y install crontabs 说明： vixie-cron 软件包是 cron 的主程序； crontabs 软件包是用来安装、卸装、或列举用来驱动 cron 守护进程的表格的程序。二、配置 cron 是 linux 的内置服务，但它不自动起来，可以用以下的方法启动、关闭这个服务： systemctl start crond //启动服务 systemctl stop crond //关闭服务 systemctl restart crond //重启服务 systemctl reboot crond //重新载入配置 systemctl status crond //查看crontab服务状态在CentOS系统中加入开机自动启动: chkconfig -