Bash

A nice cheatsheet: https://devhints.io/bash

  • Zip and unzip
    tar -czf abc.tar.gz files --exclude=pattern # gz
-cjf # bz2
tar -xzf abc.tar.gz -C path
  • Absolute path of current file
    script_dir=$(dirname $(readlink -f "$0"))
  • Test if variable is set
    # From https://stackoverflow.com/questions/3601515/how-to-check-if-a-variable-is-set-in-bash
if [ -z ${var+x} ]; then echo "var is unset"; else echo "var is set to '$var'"; fi
  • Remove artifacts mis-installed by ninja
    xargs rm < install_manifest.txt

Python

Read file line by line (using walrus operator)

with open(filename, 'r', encoding='UTF-8') as file:
    while (line := file.readline().rstrip()):
        print(line)

Run subprocess and get output

proc = subprocess.Popen(f"commands", shell=True,
                    stdin=subprocess.PIPE,
                    stdout=subprocess.PIPE,
                    stderr=subprocess.STDOUT)
stdouts, stderrs = proc.communicate()
stdouts = stdouts.decode('utf-8')
stderrs = stderrs.decode('utf-8')
    Edit this page on GitHub
Run →