=over

=item utime LIST

Changes the access and modification times on each file of a list of
files.  The first two elements of the list must be the NUMERICAL access
and modification times, in that order.  Returns the number of files
successfully changed.  The inode change time of each file is set
to the current time.  This code has the same effect as the C<touch>
command if the files already exist:

    #!/usr/bin/perl
    $now = time;
    utime $now, $now, @ARGV;

If the first two elements of the list are C<undef>, then the utime(2)
function in the C library will be called with a null second argument.
On most systems, this will set the file's access and modification
times to the current time.  (i.e. equivalent to the example above.)

    utime undef, undef, @ARGV;

=back