Not providing any documentation for a commands return values was surprising
and thought maybe I just didn't see it, my
wife swears I'm blind and I'd lose my head if it wasn't screwed on :)
Apologizes for my poor terminology.
On Fri, Nov 6, 2015 at 9:55 AM Konstantin Khomoutov <
flatw...@users.sourceforge.net> wrote:
> On Fri, 6 Nov 2015 08:26:25 -0800 (PST)
> Wink Saville wrote:
>
> > git config alias.sdiff '!'"git diff && git submodule foreach 'git
> > diff'"
> [...]
> > Thus, the alias.sdiff makes sense, but is there documentation on the
> > return values?
>
> I don't think these return values are documented but it's just the
> ages-old standard POSIX convention that the exit code 0 of a program
> indicates success while any code in range 1..127 indicates failure
> (a code > 127 usually means that the program has been killed by
> an OS signal it failed to catch and process -- such as SIGFAULT or
> SIGILL -- see man signal(7)).
>
> Hence it's customary to just distinguish between the zero and non-zero
> exit codes, and the && and || POSIX shell operators do just that:
> && does only execute the following command if the preceding one exited
> OK (returned 0) and || does only execute the following command if the
> preceding one exited signalizing a failure (non-zero). For more info
> see the sections "AND lists" and "OR lists" in [1].
>
> P.S.
> Please fix your terminology. ;-) "bash true" is a bit of a nonsense as
> exit codes are not specific to shells -- they are a property of the
> process execution model implemented by an OS (and mandated by the POSIX
> standard). And surely any POSIX-compatible (in fact, any Unix-y) shell
> treats 0 and non-0 in the same way.
>
> 1.
> http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
>
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