perl-5.34.0
$EFFECTIVE_USER_ID
$EUID
$>

The effective uid of this process. For example:

��㋘����㏍�祉�鴻�勐����� uid ���腓冴����障����� 箴�������:

    $< = $>;            # set real to effective uid
    ($<,$>) = ($>,$<);  # swap real and effective uids
    $< = $>;            # 絎� uid ���絎���� uid ���荐㊤��
    ($<,$>) = ($>,$<);  # 絎� uid ���絎���� uid ���篋ゆ

You can change both the effective uid and the real uid at the same time by using POSIX::setuid(). Changes to $> require a check to $! to detect any possible errors after an attempted change.

POSIX::setuid() ���篏帥�c�⓾��絎���� UID ���絎� UID ������������紊���眼�с����障����� $> ���紊���眼�������翫����壔��紊���贋����̬儀�����������������í�若��罎���冴������������� $! ��勉����с����壔��綽�荀���с�����

$< and $> can be swapped only on machines supporting setreuid().

$< ��� $> ��勌困�����壔��setreuid() �����泣����若�������⓾����� �����激�潟�с�勉�水櫝�純�с�����

Mnemonic: it's the uid you went to, if you're running setuid.

荐���倶��: setuid ��у��茵�筝㏍�с�������違�������� ��� 茵���� uid ��с�����