grep cheatsheet

January 18, 2025 ยท View on GitHub

Will be logging here various uses-cases of grep

  1. Print anything between 2 patterns

    # print all function names inside a python files
grep -o -P '(?<=def ).*?(?=\()' demo.py

  2. Ignore more than one pattern from search

    # ignore json and py files from output
# -v means invert-match
# -E activates extended regexp patterns (egrep). Allows use of symbols like +, |, ?
ls | grep -Ev '(.json|.py)'
# this is same as
ls | grep -v -e .json -e .py