perl - "$<"& "$>"在 Perl 中是什么意思

Question

一个例子将不胜感激。以下是我阅读它的示例:

$self->parameter(
    name => 'real_user',
    xpath => undef, 
    default => scalar(getpwuid($<))
);
$self->parameter(
    name => 'production',
    xpath => '/config/production', 
    default => $self->get('user_uid') == $>
);

Answer 1

一个 $后跟符号？致 perlvar !

$<
The real uid of this process.

$>
The effective uid of this process.

使用它们找出运行程序的用户。