Shell 到 Python 的麻烦

发布于 2024-10-31 22:08:19 字数 294 浏览 0 评论 0原文

    if ! ps ax | grep -v grep | grep -v -i tmux | grep "theserver.jar" > /dev/null; then
        echo "Server failed to start!"
    else
        echo "Server successfully started!"
    fi

请问我怎样才能用 python 做到这一点？我不知道该怎么做。请帮忙:( 我可以使用 os.system 吗？

提前致谢。

原文

    if ! ps ax | grep -v grep | grep -v -i tmux | grep "theserver.jar" > /dev/null; then
        echo "Server failed to start!"
    else
        echo "Server successfully started!"
    fi

How can i make this with python, please?
I can't figure out how to do it. Please, help :(
Can i use os.system?

Thanks in advance.

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伪心 2024-11-07 22:08:19

您可以使用 subprocess 模块进行 shell 并运行任意 shell 命令，但您可能想要考虑使用 PSI 或 psutil 模块。

它们是非标准的，因此您必须下载并安装它们，但它们会更加健壮并且不易出错。（请记住，ps 输出格式可能会在不同平台上发生变化）。这是一个示例 psutil 实现，它或多或少可以完成您想要做的事情。显然，如果您需要将 'Python' 替换为 'theserver.jar' 或使用 p.exe 或 p.cmdline需要检查的不仅仅是名称。

import psutil

def find_processes_by_name(name):
  for p in psutil.process_iter():
    try:
      if p.name == name:
        yield p.pid
    except psutil.error.AccessDenied as e:
      pass

  raise StopIteration

print "Python processes:"
for pid in find_processes_by_name('Python'):
  print '\t', pid

You can shell out with the subprocess module and run arbitrary shell commands, but you may want to consider using something like the PSI or psutil modules.

They are non-standard so you will have to download and install them, but they will be much more robust and resistant to errors. (Remember that ps output formats can change across different platforms). Here is an example psutil implementation that does more or less what you're trying to do. Obviously swap 'Python' with 'theserver.jar' or use p.exe or p.cmdline if you need to inspect more than just the name.

import psutil

def find_processes_by_name(name):
  for p in psutil.process_iter():
    try:
      if p.name == name:
        yield p.pid
    except psutil.error.AccessDenied as e:
      pass

  raise StopIteration

print "Python processes:"
for pid in find_processes_by_name('Python'):
  print '\t', pid

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木格 2024-11-07 22:08:19

假设我想知道我是否在运行 sshd 的服务器上（只是示例中 jar 文件的替换），

import os

command=" ps ax | grep -v grep | grep -v -i tmux | grep sshd"

result = os.WEXITSTATUS(os.system(command))

if os.WEXITSTATUS(os.system(command)):
  print "Server failed to start!"
else:
  print "Server successfully started!"

您需要 WEXITSTATUS 来修复 os.system 调用的返回值。供您使用，只需将 sshd 替换为 theserver.jar

Say I want to find out if I am on a server running sshd(just a replacement for the jar file in your example)

import os

command=" ps ax | grep -v grep | grep -v -i tmux | grep sshd"

result = os.WEXITSTATUS(os.system(command))

if os.WEXITSTATUS(os.system(command)):
  print "Server failed to start!"
else:
  print "Server successfully started!"

You need the WEXITSTATUS to fix the return value from the os.system call. For your use just replace sshd with theserver.jar

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