grep

Find patterns in files using regular expressions. More information: https://www.gnu.org/software/grep/manual/grep.html.

grep "search_pattern" path/to/file

grep --fixed-strings "exact_string" path/to/file

grep --recursive --line-number --binary-files without-match "search_pattern" path/to/directory

grep --extended-regexp --ignore-case "search_pattern" path/to/file

grep --context|before-context|after-context 3 "search_pattern" path/to/file

grep --with-filename --line-number --color=always "search_pattern" path/to/file

grep --only-matching "search_pattern" path/to/file

cat path/to/file | grep --invert-match "search_pattern"