use FileHandle;

$fh = new FileHandle;
if ($fh->open "<file") { print <$fh>;
    $fh->close;
}

$fh = new FileHandle "> FOO";
if (defined $fh) {
    print $fh "bar\n";
    $fh->close;
}

$fh = new FileHandle "file", "r";
if (defined $fh) {
    print <$fh>;
    undef $fh;       # automatically closes the file
}

$fh = new FileHandle "file", O_WRONLY|O_APPEND;
if (defined $fh) {
    print $fh "stuff\n";
    undef $fh;       # automatically closes the file
}

$pos = $fh->getpos;
$fh->setpos $pos;

$fh->setvbuf($buffer_var, _IOLBF, 1024);

($readfh, $writefh) = FileHandle::pipe;

autoflush STDOUT 1;