Pronounced like the girl's name or the legal action (both spelled with a terminal "e," although this word is not), to su is to become another user on a UNIX system.
Without arguments, su (with the correct password, by default) will allow one to become root
(the entry for which may or may not have been posted).
In a figurative sense, to su is to gain the omnipotent power over something which resembles the power that root has over a UNIX system.
Примеры использования:
He's so naive that it's hard to not do a su in his mind.
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