Using SubProcess in Python for Awk

Question

I am trying to run this command git status -vv | awk 'NR>5 {print $0}' from within a Python file. But I cannot get the awk command working.

Here is a sample result of my git st:

# On branch master
# Your branch is ahead of master by 2 commits.
#
#
#       modified:   file1
#       modified:   file2
#       modified:   file3

When I run the command from the terminal, I get what I want:

#       modified:   file1
#       modified:   file2
#       modified:   file3

I am having trouble implementing it from within a Python script:

import sys
import subprocess as sb

ps = sb.Popen(("git","status","-vv"),stdout=sb.PIPE)
output = sb.check_output(('awk','"NR>5 {print $0}"'),stdin=ps.stdout)
print output

However, this returns just the git st results without the awk performed on the lines. How can I do this from within python to get the same output as I do when running in the terminal.

Saurabh P Bhandari · Accepted Answer · 2020-05-15 23:35:59Z

2

The following code should work (just remove the double quotes for awk's argument)

import sys
import subprocess as sb

ps = sb.Popen(("git","status","-vv"),stdout=sb.PIPE)
output = sb.check_output(('awk','NR>5 {print $0}'),stdin=ps.stdout)
print output

answered May 15, 2020 at 23:35

Saurabh P Bhandari

6,9952 gold badges22 silver badges58 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

programminglearner Over a year ago

This worked perfectly. And kudos for actually looking at my provided code and catching a fix instead of just recommending to use shell=True !

Shloka Bhalgat Over a year ago

I think for awk subprocess.check_ouput(...) is the correct way to run this command for shell= False. This worked for me too

Alex Reynolds · Accepted Answer · 2020-05-15 23:30:30Z

0

This might be much simpler:

#!/usr/bin/python3                                                                                                                                                                 

import sys
import subprocess as sb

cmd = "git status -vv | awk '(NR>5){ print $0 }'"

output = sb.check_output(cmd, stderr=sb.STDOUT, shell=True)
sys.stdout.write('{}'.format(output))

answered May 15, 2020 at 23:30

Alex Reynolds

97.3k59 gold badges251 silver badges356 bronze badges

Collectives™ on Stack Overflow

Using SubProcess in Python for Awk

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related