Answering questions that may arise related to the meaning of portions of an IEEE standard concerning specific applications.

IEEE Standards Interpretation for IEEE Std 1003.1™-2001 IEEE Standard Standard for Information Technology -- Portable Operating System Interface (POSIX®)

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Interpretation Request #90
Topic: mailx next command Relevant Sections: XCU mailx

If a 'next' command follows a 'hold' command in mailx, traditional implementations display the next message following the one the 'hold' applied to, as if the holded message had been printed. This makes sense since the 'hold' usually implies that the user knows what is in the message and does not wish to view it again immediately. But the behavior apparently conflicts with POSIX as the description states that the 'next' command may only advance if the current message has been written before, which is not the case with 'hold'.

Update the description of the 'next' command such that 'hold' makes it also advance to the following message.

Interpretation Response
The standards states the current requirements for mailx and next, and conforming implementations must conform to this. However, concerns have been raised about this which are being referred to the sponsor.

Rationale for Interpretation