fgrep

Matches fixed strings in files. Equivalent to grep -F. More information: https://www.gnu.org/software/grep/manual/grep.html.

• Search for an exact string in a file:

fgrep search_string path/to/file

• Search only lines that match entirely in one or more files:

fgrep -x search_string path/to/file1 path/to/file2 …

• Count the number of lines that match the given string in a file:

fgrep -c search_string path/to/file

• Show the line number in the file along with the line matched:

fgrep -n search_string path/to/file

• Display all lines except those that contain the search string:

fgrep -v search_string path/to/file

• Display filenames whose content matches the search string at least once:

fgrep -l search_string path/to/file1 path/to/file2 …