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$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().