On Monday, September 29, 2014 9:51:45 PM UTC+2, Chet Ramey wrote: > > > > So it seems the order is wrong. As a consequence, and this is confirmed by > > experience, the #!/bin/sh prefix behaves as featuristic bash. > > My suggestion then is to undo that mistake. > > Posix mode was never intended to turn bash into a shell that provides only > what Posix specifies and nothing more. It makes bash conform to Posix by > changing things where the default mode differs from what Posix specifies. > Posix allows this, and allows extensions, and every shell that claims > Posix conformance (except perhaps `posh') offers extensions beyond minimal > Posix features.
Forget about posix mode then: bash -p (privileged) offers a lean-and-mean variant which pretty much satisfies anybody needing "just sh". However, there is no way to store an option in a symbolic link, so all distributions doing "sh -> bash" are bound to perpetuate the danger (of "eval-from-the-env"). So it would seem normal for some of them to move away from bash as the default sh. -Alex
