如何查看屏幕是否正在运行? [英] How to check screen is running?

问题描述

如何在Python中检查是否具有给定名称的屏幕.例如，检查server1是否正在运行?

How to check in Python whether the screen with the given name. For example, check if server1 is running?

谢谢:)

推荐答案

用于查找当前屏幕会话的内置命令为screen -ls

The built in command for finding current screen sessions is screen -ls

要在python中获得相同的功能，

To get the same functionality in python:

from subprocess import check_output

def screen_present(name):
        var = check_output(["screen -ls; true"],shell=True)
        if "."+name+"\t(" in var:
                print name+" is running"
        else:
                print name+" is not running"

screen_present("server1")

对代码的一些评论:

• 我必须使用; true和shell=True，因为屏幕返回的退出代码为1，在check_output函数中不能很好地发挥作用.
• 此外，我添加了"."+和+\t(以确保我们匹配的是屏幕名称，而不是打印输出的另一部分.

• I had to use ; true and shell=True because screen returns a exit code of 1, which doesn't play well with the check_output function.
• Also, I added the "."+ and +\t( to make sure that we were matching the screen name and not another part of the printout.

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