This module provides a Unix-like command `colgrep'. 
This commad will "grep" along a specified column over all the row of a given file,
and every (the whole) row which is hit by that "grep" will be output. 


=head1 DESCRIPTION



 Copyright (c) 2021 Toshiyuki SHIMONO. All rights reserved.
 This program is free software; you can redistribute it and/or
 modify it under the same terms as Perl itself.