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utmpof course has fleeting, temporary, information and was the initial file available, but I have no confirmation that that might be the origin of that name part. You should post that as a new question.'w'come from'when'? Becausewtmprecords when user logged in and logged out.whoonly looks inutmp, and has nothing to do withwtmp, it seems implausible that their names are connected./tmpdirectory. (Elsewhere temp is the more common abbreviation for the same thing.)