Ugrep is a true drop-in replacement for GNU grep (assuming you copy or symlink ug to grep, egrep and fgrep), unlike many other popular grep claiming to be "grep alternatives" or "replacements" when those actually implement incompatible command-line options and use a different, incompatible regex matcher i.e. Perl regex versus POSIX regex grep (ugrep supports both) Ugrep is fast, user-friendly, and