grep cheatsheet

Posted on 15 Dec, 2021

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