On 09/27/2014 04:21 PM, Chet Ramey wrote: >> 1) make bash when invoked as /bin/sh fail those bash-isms > > It's come up before, and it's not something that bash has ever been > intended to do. When invoked as /bin/sh, bash will behave as a posix > superset. Posix allows this. Even dash is a posix superset. Although dash tries to be more minimalistic at not adding new features without first getting those features specified by posix, there are definite existing extensions in the code base that the dash maintainer is unwilling to remove because of the risk of breaking backward compatibility. > >> 2) build a 'real' /bin/sh without those compiled in. This begs the definition of 'real', but IMHO if it's not in POSIX, it shouldn't be in 'real' /bin/sh > > This is dash's niche. If you want a truly minimalist shell that will loudly complain at attempts to use extensions, use 'posh' instead of 'dash'. But Chet's point remains - there's no need to dumb down bash to serve as a minimalist shell, because that's a maintenance burden, and there are already other projects that have decided to take on that role. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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