linux - 服务器定时计划crontab参数疑问

Question

具体的crontab命令参数我知道一次分别是：分 时 日 月 周 脚本命令

如果我想设置每半小时执行一次改怎么设置呢！这样设置的30 时 日 月 周 脚本命令貌似没执行呢！没拉到日志

Answer 1

You are executing this at 30 minutes every hour, so you are executing it once an hour
In the window that comes out of crontab -e, you don’t need to write the user name, just write the command directly

*/30 * * * * 命令

Answer 2

*/30 * * * * means execution every thirty minutes

The configuration of the script is:
分 时 日 月 周 用户 脚本命令
Don’t omit the running user, otherwise the command will be parsed into the user, causing failure

Answer 3

Your setting really doesn’t work, it should be like this*/30 * * * * /server/php7.02/php /htdocs/example.web.com/action/post/example.php

Answer 4

Graphic reference method
http://www.corntab.com/