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#$EFFECTIVE_USER_ID

#$EUID

#$>

The effective uid of this process. For example:

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

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

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

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

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