rgrep

Recursively find patterns in files using regular expressions. Equivalent to grep -r. More information: https://www.gnu.org/software/grep/manual/grep.html.

rgrep "search_pattern"

rgrep --ignore-case "search_pattern"

rgrep --extended-regexp "search_pattern"

rgrep --fixed-strings "exact_string"

rgrep "search_pattern" path/to/file_or_directory