This is Perl module File::History.

INSTALLATION

File::History installation is straightforward. If your CPAN shell is set up,
you should just be able to do

    % cpan File::History

Download it, unpack it, then build it as per the usual:

    % perl Makefile.PL
    % make && make test

Then install it:

    % make install

DOCUMENTATION

File::History documentation is available as in POD. So you can do:

    % perldoc File::History

to read the documentation online with your favorite pager.

Kazuhiro Nishikawa