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Branden Robinson" To: =?utf-8?B?0L3QsNCx?= Cc: Seth McDonald , Alejandro Colomar , linux-man@vger.kernel.org Subject: Re: [RFC PATCH v1 1/2] src/bin/sman: Add script Message-ID: <20260128223151.tkp6urusx7wtrpyo@illithid> References: <20260128190730.aylqwn55b6bo63xi@illithid> Precedence: bulk X-Mailing-List: linux-man@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="hvivjdpnp7yv6dyk" Content-Disposition: inline In-Reply-To: --hvivjdpnp7yv6dyk Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [RFC PATCH v1 1/2] src/bin/sman: Add script MIME-Version: 1.0 At 2026-01-28T23:02:24+0100, =D0=BD=D0=B0=D0=B1 wrote: > On Wed, Jan 28, 2026 at 01:07:30PM -0600, G. Branden Robinson wrote: > > B) (While the foregoing discusses GNU Bash specifically, I have > > read--but not seen a proof, and can't promise that I'd understand > > a proof if I saw one--that POSIX shell is undecidable as well, > > the "alias" feature being a sufficient condition to produce > > thus.) >=20 > If, AIUI, "undecidable" in this case means "the parser depends on the > execution of the program being parsed", then alias is sufficient do > ensure this property, but I think it's the only feature that lets you > inject macros into the parser, or otherwise interact with it directly > like this. That sounds plausible to me, and consistent with my occasional, undisciplined, and inadequate research on the topic. Shall we organize a movement to get "alias" taken out of POSIX 202y/203x? I don't care if implementations keep it around, but it sure seems like a dreadful thing for the standard to _mandate_. 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