Run a list of bash commands from a string in python

Question

My program is a text editor for bash scripts. For the run option I need to obtain all the commands typed in the textbox and execute them as if they were an entire script (the option of writing the string in a file and then execute it is also possible). Also, I need to pass some arguments (a string in the entry box), and obtain stderr and stdout if the user wants it (checkboxes).

My program looks like this:

interface

I know how to obtain data from all graphic components, my big problem is that I'm not sure what to do: subprocess.call, subprocess.popen, os.system, etc. There are a lot of options. I need to use just one command whatever they write on the text box: pipes, simple commands, argument printing, etc.

It is desirable too that nothing is shown in my console.

Thank you for helping! Every idea is welcome!

I'm using Ubuntu.

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– Joe C, Commented Mar 18, 2017 at 22:23

Jonathan Ellington · Accepted Answer · 2017-03-18 21:04:39Z

2

Use subprocess. It was intended to replace other methods of running external processes. Rather than repeat the documentation, I will try to summarize:

In Python 2.7 you have several options:

subprocess.call : runs the command, returning the returncode

subprocess.check_call : raise exception if nonzero returncode is returned

subprocess.check_output : run command, returning output as a string

In Python 3.5+, the interface was simplified and you can simply use subprocess.run(), which returns a subprocess.CompletedProcess object from which you can access stdout, stderr, return code, etc.

https://docs.python.org/2.7/library/subprocess.html https://docs.python.org/3.6/library/subprocess.html

answered Mar 18, 2017 at 21:04

Jonathan Ellington

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