如何运行ps cax | grep某事“在Python中? [英] How to run " ps cax | grep something " in Python?

问题描述

如何在其中包含管道|的情况下运行命令?

子流程模块似乎很复杂...

有没有类似的东西

output,error = `ps cax | grep something`

像在shell脚本中一样?

解决方案

请参见替换外壳管道:

import subprocess

proc1 = subprocess.Popen(['ps', 'cax'], stdout=subprocess.PIPE)
proc2 = subprocess.Popen(['grep', 'python'], stdin=proc1.stdout,
                         stdout=subprocess.PIPE, stderr=subprocess.PIPE)

proc1.stdout.close() # Allow proc1 to receive a SIGPIPE if proc2 exits.
out, err = proc2.communicate()
print('out: {0}'.format(out))
print('err: {0}'.format(err))

PS.使用shell=True可能很危险.参见文档中的警告.

---

还有一个 sh模块，它可以使Python中的子流程脚本更加令人愉悦:

import sh
print(sh.grep(sh.ps("cax"), 'something'))

How do I run a command with a pipe | in it?

The subprocess module seems complex...

Is there something like

output,error = `ps cax | grep something`

as in shell script?

解决方案

See Replacing shell pipeline:

import subprocess

proc1 = subprocess.Popen(['ps', 'cax'], stdout=subprocess.PIPE)
proc2 = subprocess.Popen(['grep', 'python'], stdin=proc1.stdout,
                         stdout=subprocess.PIPE, stderr=subprocess.PIPE)

proc1.stdout.close() # Allow proc1 to receive a SIGPIPE if proc2 exits.
out, err = proc2.communicate()
print('out: {0}'.format(out))
print('err: {0}'.format(err))

PS. Using shell=True can be dangerous. See for example the warning in the docs.

---

There is also the sh module which can make subprocess scripting in Python a lot more pleasant:

import sh
print(sh.grep(sh.ps("cax"), 'something'))

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