crontab

使用crontab你可以在指定的时间执行一个shell脚本或者一系列Linux命令，例如系统管理员安排一个备份任务使其每天都运行。 crontab -e 编辑当前用户下的定时任务 */15 * * * * /home/ap/tunnel/command/dbjob/outbound/objob/ob_job_archive_all_10m.sh >> /home/ap/tunnel/command/dbjob/outbound/objob/outbound_runjob.log 2>&1 每15分钟执行ob_job_archive_all_10m.sh任务，并将结果输出到outbound_runjob.log日志中 0 3 * * * /home/ap/tunnel/command/dbjob/magw/job_magw.sh >> /home/ap/tunnel/command/dbjob/magw/magw_runjob.log 2>&1 每天凌晨三点执行job_magw.sh脚本，并把结果输出到/magw_runjob.log日志中 Cron 各项的描述 以下是 crontab 文件的格式： {minute} {hour} {day-of-month} {month} {day-of-week} {full-path-to-shell-script} o minute:

crontab 简介 crontab 主要用于需要管理周期执行定时任务的场景 crontab 安装 （有些系统默认已经带了 crontab，无需安装的朋友可以直接跳过本节） 安装： yum install -y vixie-cron yum install -y crontabs 启动： systemctl start crond.service 重启： systemctl restart crond.service 设置开机启动： systemctl enable crondservice 命令格式 crontab 主要有以下几种命令格式 crontab [-u user] file crontab [-u user] [-l | -r | -e] [-i] [-s] crontab -n [ hostname ] crontab -c 我们发现crontab 的命令还挺多的，我们先从最常用的开始： crontab -e 这个命令用于编辑定时任务列表，当我们输入完命令，按下回车键之后，它会使用默认编辑器（通常是vi/vim）打开一个文件，里面的内容可能是这样子的： 这很可能是你看到的，在设置任何定时任务之前，这里是看不到任何内容的，如果你已经设置了内容的话，那么看到的可能是这样的 这是我提前设置好的定时任务，我们暂时不解释这个配置的功能，但从这里可以知道，通过 crontab

I've got a python program which runs via crontab and that works perfectly. However, I decided to add the ability to notify me of what it's doing, and suddenly it's failing. It runs from the command line, however, running it as a crontab program causes it to fail libnotify-Message: Unable to get session bus: /bin/dbus-launch terminated abnormally with the following error: Autolaunch error: X11 initialization failed. What am I doing wrong? Edit I would like this program to still run from cron and be able to take advantage of notifying the user of it's work. Is there any way to do this? Edit 2 I

I very very rarely use Linux and so don't have any experience with bash scripts and cron jobs. This is in fact my first attempt. So it's probably something really simple to fix. I have the following: /etc/cron.d/clear-mixtape-dir.sh permissions are: 644 #!/bin/bash # Clears the /tmp/mixtape2 directory rm -rf "/tmp/mixtape2/"* My crontab file looks like so: SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin MAILTO=root HOME=/ */15 * * * * /etc/cron.d/clear-mixtape-dir.sh >/dev/null 2>&1 I'm trying to execute the .sh script every 15 minutes. Everything i've found says this should work, but it

I will preface this by saying I am very new to command line programming with Debian Ubuntu... I have been trying to set up a crontab list on a Debian Ubuntu server but have not been able to get it to work. Here is a sample: MAILTO=myemail@gmail.com * * * * * wall test * * * * * /usr/bin/python2.6 /home/user/test.py > /home/user/clean_tmp_dir.log The above shows up when I type "crontab -l" but no resulting output appears in the console. The "test.py" is supposed to generate a csv file but none is being created. I am not receiving any output/error emails. I tried to find a log, but "var/log/cron

we need run one function periodically in Java web application . How to call function of some class periodically ? Is there any way that call function when some event occured like high load in server and so on . what is crontab ? Is that work periodically ? Brian Agnew To call something periodically, see TimerTask If you need something more robust you can use Quartz As for crontab is the scheduling tool on Unix machines. For calling methods when server has high load, you have at least two possible approaches. Your App Server might have management hooks that would you allow to monitor its