Linux Bash 脚本如何在新进程中休眠然后执行命令
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原文地址: http://stackoverflow.com/questions/9934828/
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Bash script how to sleep in new process then execute a command
提问by David Mulder
So, I was wondering if there was a bash command that lets me fork a process which sleeps for several seconds, then executes a command.
所以，我想知道是否有一个 bash 命令可以让我分叉一个睡眠几秒钟的进程，然后执行一个命令。
Here's an example:
下面是一个例子：
sleep 30 'echo executing...' &
^This doesn't actually work (because the sleep command only takes the time argument), but is there something that could do something like this? So, basically, a sleep command that takes a time argument and something to execute when the interval is completed? I want to be able to fork it into a different process then continue processing the shell script.
^这实际上不起作用（因为 sleep 命令只接受 time 参数），但是有什么可以做这样的事情吗？那么，基本上，一个带有时间参数的 sleep 命令以及在间隔完成时要执行的操作？我希望能够将它分叉到不同的进程中，然后继续处理 shell 脚本。
Also, I know I could write a simple script that does this, but due to some restraints to the situation (I'm actually passing this through a ssh call), I'd rather not do that.
另外，我知道我可以编写一个简单的脚本来执行此操作，但是由于情况的一些限制（我实际上是通过 ssh 调用传递的），我宁愿不这样做。
采纳答案by John Zwinck
You can invoke another shell in the background and make it do what you want:
您可以在后台调用另一个 shell 并使其执行您想要的操作：
bash -c 'sleep 30; do-whatever-else' &
The default interval for sleep is in seconds, so the above would sleep for 30 seconds. You can specify other intervals like: 30mfor 30 minutes, or 1hfor 1 hour, or 3dfor 3 days.
睡眠的默认间隔以秒为单位，因此上面的将睡眠 30 秒。您可以指定其他时间间隔，例如：30m30 分钟、1h1 小时或3d3 天。
回答by Idelic
You can do
你可以做
(sleep 30 && command ...)&
Using &&is safer than ;because it ensures that command ...will run only if the sleep timer expires.
使用&&比;它更安全，因为它确保command ...只有在睡眠计时器到期时才会运行。
