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man-pages.7: Note preferred approach for 'duplicate' errors 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2017-04-21 15:39:23 +02:00
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@ -316,6 +316,14 @@ values that may be placed in
in the event of an error, along with information about the cause
of the errors.
Where several different conditions produce the same error,
the preferred approach is to create separate list entries
(with duplicate error names) for each of the conditions.
This makes the separate conditions clear, may make the list easier to read,
and allows metainformation
(e.g., kernel version number where the condition first became applicable)
to be more easily marked for each condition.
.IR "The error list should be in alphabetical order" .
.TP
.B ENVIRONMENT