You are viewing the version of this documentation from Perl 5.6.2. View the latest version
$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.) $< and $> can be swapped only on machines supporting setreuid().