Re: [PATCH] errno.3: Add values for all errors

On Thu, Nov 23, 2017 at 10:07:13AM +0100, Michael Kerrisk (man-pages) wrote:

       On  Linux, the error numbers that correspond to each symbolic name
       vary somewhat across architectures.  Therefore, numeric values are
       not  included in the list of error names below.  On any particular
       system, one can obtain a list of all symbolic error names and  the
       corresponding error numbers using the errno(1) command:

What package does the errno command come with?  It would have been very
useful for me multuple times, but doesn't come by default at least on my
Debian stretch system, and a simple apt-cache search didn't find it
either.
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