如何安排一定的时间（例如5小时）？ [英] How to schedule task with certain (say, 5) hour period?

问题描述

使用crontab安排任务是很常见的。但是，我发现crontab只能按每小时或每天安排任务。如果我想每4小时安排一次任务，我仍然可以通过设置6个日常任务来完成任务。但是，如果我想要有一段时间不能弥补一天，比如说，每5小时/ 7小时完成一项任务？有没有办法在crontab中按小时期间设置任务或使用其他工具？ （如果该工具可以在像Heroku / Openshift这样的PaaS上运行，那会更好）

每分钟crontab设置一个任务，每5分钟发生一次（ https://github.com/openshift-quickstart/openshift-cacti-quickstart/blob/master/.openshift/cron/minutely/cactipoll ）

  if [！ -f $ OPENSHIFT_DATA_DIR / last_run];然后
 touch $ OPENSHIFT_DATA_DIR / last_run 
 fi 
 if [[$（find $ OPENSHIFT_DATA_DIR / last_run -mmin +4）]];然后＃每5分钟运行
 rm -f $ OPENSHIFT_DATA_DIR / last_run 
 touch $ OPENSHIFT_DATA_DIR / last_run 
 php $ OPENSHIFT_REPO_DIR / php / poller.php> $ OPENSHIFT_DATA_DIR / cacti.log 2>& 1 
 
 fi 
  

基本上该任务每分钟运行一次，但仅在5分钟后才能执行。你可以很容易地适应这个使用小时而不是分钟。

It is common to use crontab to schedule a task. However, I found that crontab can only schedule tasks on a minutely, hourly or daily basis. If I want to schedule task on every 4 hours, I can still make it by setting up 6 daily task. However, what if I want to have a period that doesn't make up one day, say, a task every 5 hours / 7 hours? Is there a way to set up the task by hour period in crontab or using other tools? (would be even better if that tool can be run on PaaS like Heroku / Openshift)

解决方案

Here is an example of using the minutely crontab to setup a task that happens every 5 minutes (https://github.com/openshift-quickstart/openshift-cacti-quickstart/blob/master/.openshift/cron/minutely/cactipoll)

if [ ! -f $OPENSHIFT_DATA_DIR/last_run ]; then
    touch $OPENSHIFT_DATA_DIR/last_run
fi
if [[ $(find $OPENSHIFT_DATA_DIR/last_run -mmin +4) ]]; then #run every 5 mins
    rm -f $OPENSHIFT_DATA_DIR/last_run
    touch $OPENSHIFT_DATA_DIR/last_run
    php $OPENSHIFT_REPO_DIR/php/poller.php > $OPENSHIFT_DATA_DIR/cacti.log 2>&1

fi

Basically the task runs every minute, but only gets executed after 5 minutes have passed. You can easily adapt this to use hours instead of minutes.

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