tkGrep: tkGrep is a Graphical User Interface to the Unix Grep command. It provides point and click access to Command Line Options, as well as a Toolbar for rapid execution of your grep command. tkSort: tkSort is just like tkGrep, except that it is built for the Unix sort command. tkREM: tkREM provides a Graphical User Interface for building Regular Expressions. The major modes (grep, Perl, Tcl, Python, Emacs, Sed & Awk) have buttons with meta-characters as their label.