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 files:
  fgrep -x {{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}}