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如何检查屏幕是否正在运行？

发布于 2024-12-13 21:46:49 字数 65 浏览 2 评论 0原文

如何在Python中检查屏幕是否具有给定的名称。例如，检查server1是否正在运行？

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如若梦似彩虹 2024-12-20 21:46:49

用于查找当前屏幕会话的内置命令是 screen -ls

要在 python 中获得相同的功能：

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")

对代码的一些注释：

我必须使用 ; true 和 shell=True 因为 screen 返回退出代码 1，这与 check_output 函数不能很好地配合。
另外，我添加了 "."+ 和 +\t( 以确保我们匹配屏幕名称而不是打印输出的其他部分。

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

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")

A couple of comments on the code:

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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赤濁 2024-12-20 21:46:49

您可以使用 subprocess 和 pgrep：

import subprocess

p = subprocess.check_output(['pgrep', '-f', 'screen'])
print p

you could use subprocess and pgrep:

import subprocess

p = subprocess.check_output(['pgrep', '-f', 'screen'])
print p

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别靠近我心 2024-12-20 21:46:49

首先，你想实现什么目标？您知道您可以简单地重新连接正在运行的屏幕会话，是吗？

screen -DRS admin # creates a new session if it isn't running

同样，使用 screen -x -S admin 来共享 admin 会话，而无需强制分离已连接的用户。

直接回答：

您可以简单地使用列出所有正在运行的会话的输出

screen -ls

，显示它们是否也已附加：

There are screens on:
        6675.third      (11/04/2011 09:25:49 PM)        (Attached)
        6668.pts-2.koolu        (11/04/2011 09:25:38 PM)        (Attached)
        6644.admin      (11/04/2011 09:25:21 PM)        (Detached)
3 Sockets in /var/run/screen/S-sehe.

First off, what are you trying to achieve? You know that you can simply reattach a running screen session, do you?

screen -DRS admin # creates a new session if it isn't running

Likewise use screen -x -S admin to share the admin session without force-detaching the connected user(s).

Direct answer:

You can simply use the output of

screen -ls

which lists all running sessions, showing whether they are attached as well:

There are screens on:
        6675.third      (11/04/2011 09:25:49 PM)        (Attached)
        6668.pts-2.koolu        (11/04/2011 09:25:38 PM)        (Attached)
        6644.admin      (11/04/2011 09:25:21 PM)        (Detached)
3 Sockets in /var/run/screen/S-sehe.

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