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 <w...@saville.com> 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 > -- You received this message because you are subscribed to the Google Groups "Git for human beings" group. To unsubscribe from this group and stop receiving emails from it, send an email to git-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
