#!/usr/bin/perl -w
use strict;

sub show_times {
    my ($f, $note) = @_;
    printf "atime=%d, mtime=%d, ctime=%d - %s\n", (stat($f))[8..10], $note;
}

my $file = shift or die $!;

# save atime
my ($atime, $mtime) = (stat($file))[8,9];

show_times($file, "initially");

# read from file
{ open my $fh, '<', $file or die $!; <$fh>; }

show_times($file, "after read");

# restore atime
utime($atime, $mtime, $file) or die "utime: $!";

show_times($file, "after atime restored");