! Aware to Perl: $EFFECTIVE_USER

$EFFECTIVE_USER_ID
$EUID
$>

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The real uid of this process. (Mnemonic: it's the uid you came FROM, if you're running setuid.)

$EFFECTIVE_USER_ID

$EUID

The effective uid of this process. Example:

    $< = $>;            # set real to effective uid
    ($<,$>) = ($>,$<);  # swap real and effective uid

(Mnemonic: it's the uid you went TO, if you're running setuid.) Note: ``$<'' and ``$>'' can be swapped only on machines supporting setreuid().

Source: Perl predefined variables
Copyright: Larry Wall, et al.

(Corrections, notes, and links courtesy of RocketAware.com)

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