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=head1 NAME

File::Overwrite - overwrite the contents of a file and optionally unlink it

=head1 SYNOPSIS

    use File::Overwrite qw(overwrite);
    
    # haha, now no-one will know I stole it
    overwrite('sekrit_formular.txt');
    unlink('sekrit_formular.txt');

=head1 DESCRIPTION

This module provides a few simple functions for overwriting data files.  This
will protect against the simplest forms of file recovery.

=head1 SECURITY

This module makes all kinds of assumptions about your system - how the disks
work, how the filesystem works, and so on.  Even if it does overwrite the