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import rosgraph.masterapi

m = rosgraph.masterapi.Master('/my_node')
services = m.getSystemState()[2]

service_names = [x[0] for x in services]

print (service_names)

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grep -R "<string to find>" <path>

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# revert a file
git checkout -- filename

# pull changes maintaining local changes
git stash
git pull
git stash pop

# Changing a remote's URL
https://help.github.com/articles/changing-a-remote-s-url/

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To write the output of a command to a file, there are basically 10 commonly used ways.

Please note that the n.e. in the syntax column means "not existing".
There is a way actually, but it's too complicated to fit into the column. You can find a helpful link in the List section about it.

Overview:

          || visible in terminal ||   visible in file   || existing
  Syntax  ||  StdOut  |  StdErr  ||  StdOut  |  StdErr  ||   file   
==========++==========+==========++==========+==========++===========

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# remove last word
Ctrl + w

# remove all words
Ctrl + u

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pip freeze > requirements.txt

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python -m compileall <file_1>.py <file_n>.py

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watch -n0 <command>

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/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user

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#!/usr/bin/env bash

# Script to check Spanish Christmas Lottery
# more info: https://servicios.elpais.com/sorteos/loteria-navidad/api/

AUTO_RELOAD="120" # seconds

declare -A mainPrizes
mainPrizes['numero1']='1er Premio'
mainPrizes['numero2']='2º  Premio'