On Mon, 25 Mar 2019 at 11:18, Kevin Fenzi <kevin@xxxxxxxxx> wrote:
>
> On 3/25/19 8:02 AM, Adam Williamson wrote:
> > On Mon, 2019-03-25 at 12:59 +0100, Dridi Boukelmoune wrote:
> >> And since RPM appears to be configurable for the
> >> default interpreter, have it use /usr/bin/bash by default.
> >
> > TBH, it seems to me reasonable that we just do this.
> >
> > If our position is that we actually expect Fedora package scriptlets to
> > be executed by bash and don't think it's a problem if they don't work
> > when executed by some other shell, why not this make this clear and
> > explicit in this way instead of having the default be sh, but then tell
> > people sh must be bash?
>
> Doesn't bash behave slightly differently when invoked as 'sh' ?
>
> Long ago it used to, but I don't know if thats still the case...
>
It will interpret some things differently but does not shut off things
like pushd/popd and $() and various other things that are either
considered non-POSIX
Man page:
If bash is invoked with the name sh, it tries to mimic the startup
behavior of historical versions of sh as closely as possible, while
conforming to the POSIX standard as well. When invoked as an interac‐
tive login shell, or a non-interactive shell with the --login option,
it first attempts to read and execute commands from /etc/profile and
~/.profile, in that order. The --noprofile option may be used to
inhibit this behavior. When invoked as an interactive shell with the
name sh, bash looks for the variable ENV, expands its value if it is
defined, and uses the expanded value as the name of a file to read and
execute. Since a shell invoked as sh does not attempt to read and exe‐
cute commands from any other startup files, the --rcfile option has no
effect. A non-interactive shell invoked with the name sh does not
attempt to read any other startup files. When invoked as sh, bash
enters posix mode after the startup files are read.
When bash is started in posix mode, as with the --posix command line
option, it follows the POSIX standard for startup files. In this mode,
interactive shells expand the ENV variable and commands are read and
executed from the file whose name is the expanded value. No other
startup files are read.
====
The argument of where posix conformity ends and where adding features begins.
> kevin
>
>
>
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--
Stephen J Smoogen.
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