zfgrep
Matches fixed strings in possibly compressed files.
TLDR
Search for an exact string in a file
$ zfgrep [search_string] [path/to/file]
Count the number of lines that match the given string in a file
$ zfgrep --count [search_string] [path/to/file]
Show the line number in the file along with the matching lines
$ zfgrep --line-number [search_string] [path/to/file]
Display all lines except those that contain the search string
$ zfgrep --invert-match [search_string] [path/to/file]
List only filenames whose content matches the search string at least once
$ zfgrep --files-with-matches [search_string] [path/to/file1 path/to/file2 ...]
