Hi,
I have some remarks/questions on POSIX Command Search and Execution,
related to bash and some to POSIX itself.
Introduction
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_01_01
describes what to do when a simple command name needs to be resolved.
A
On 11/6/23 10:48 AM, Mike Jonkmans wrote:
POSIX Command Search
According to these docs (what I make of it), resolving is done in steps,
the first applicable step is used:
1) No slash in the name.
1a) Run the builtin if the name matches that of a Special Builtin.
1b) List several names that h
Date:Mon, 6 Nov 2023 14:28:24 -0500
From:Chet Ramey
Message-ID: <0ab6075e-22bf-43cd-992c-b2476f626...@case.edu>
| On 11/6/23 10:48 AM, Mike Jonkmans wrote:
| > According to these docs (what I make of it), resolving is done
| > in steps, the first applicable step
Thanks for the answers, Chet.
On Mon, Nov 06, 2023 at 02:28:24PM -0500, Chet Ramey wrote:
> On 11/6/23 10:48 AM, Mike Jonkmans wrote:
>
> > Q: Why check for regular builtins? That was already done in 1d.
> Implementations can provide other builtins. The check in 1d is only for
> those specific
On 11/6/23 9:39 PM, Robert Elz wrote:
| > 1eI) Search is successful.
| > 1eIa) Check for `regular builtins' and functions
| >and invoke that regular builtin/function.
| >Q: Shouldn't this specify an ordering for builtins/functions?
|
| The text seems to imply th
On 11/7/23 8:54 AM, Mike Jonkmans wrote:
Thanks for the answers, Chet.
On Mon, Nov 06, 2023 at 02:28:24PM -0500, Chet Ramey wrote:
On 11/6/23 10:48 AM, Mike Jonkmans wrote:
Q: Why check for regular builtins? That was already done in 1d.
Implementations can provide other builtins. The chec
On Tue, Nov 07, 2023 at 09:39:33AM +0700, Robert Elz wrote:
> Date:Mon, 6 Nov 2023 14:28:24 -0500
> From:Chet Ramey
> Message-ID: <0ab6075e-22bf-43cd-992c-b2476f626...@case.edu>
>
> | On 11/6/23 10:48 AM, Mike Jonkmans wrote:
> | > According to these docs (what I
On Tue, Nov 07, 2023 at 11:49:25AM -0500, Chet Ramey wrote:
> On 11/7/23 8:54 AM, Mike Jonkmans wrote:
...
> > > Look at https://www.austingroupbugs.net/view.php?id=854 for a discussion
> > > of this issue.
> > Thanks for the link, I find that very hard to read though.
> It's also incomplete; the
On 11/7/23 5:04 PM, Mike Jonkmans wrote:
| > 1d) Lists 20 fixed utility names (like alias, cd etc.) that are
| > to be invoked at his point. No PATH search yet.
| > These are the `regular builtins'.
In the next standard the ones listed are the intrinsic builtins,
and includes
On 11/7/23 5:37 PM, Mike Jonkmans wrote:
On Tue, Nov 07, 2023 at 11:49:25AM -0500, Chet Ramey wrote:
On 11/7/23 8:54 AM, Mike Jonkmans wrote:
...
Look at https://www.austingroupbugs.net/view.php?id=854 for a discussion
of this issue.
Thanks for the link, I find that very hard to read though
Date:Tue, 7 Nov 2023 23:04:10 +0100
From:Mike Jonkmans
Message-ID: <20231107220410.gc27...@jonkmans.nl>
| In particular, a user function with the name of a standard utility,
| will be called at this point.
Yes. That much is very clear.
| Chet mentioned that
On Wed, Nov 08, 2023 at 10:38:19AM -0500, Chet Ramey wrote:
> On 11/7/23 5:04 PM, Mike Jonkmans wrote:
>
> It depends on your requirements. If you want something that is easy to
> explain to users, you want to reduce the distinction between `intrinsics'
> and `regular builtins' to something as sma
On Wed, Nov 08, 2023 at 11:52:19PM +0700, Robert Elz wrote:
> Date:Tue, 7 Nov 2023 23:04:10 +0100
> From:Mike Jonkmans
> Message-ID: <20231107220410.gc27...@jonkmans.nl>
>
> | It makes sense to partition the builtins in three categories with
> | a separate name fo
On Wed, Nov 08, 2023 at 10:42:20AM -0500, Chet Ramey wrote:
> On 11/7/23 5:37 PM, Mike Jonkmans wrote:
> > On Tue, Nov 07, 2023 at 11:49:25AM -0500, Chet Ramey wrote:
> > > On 11/7/23 8:54 AM, Mike Jonkmans wrote:
> > So the discussion is hidden. Hmm.
> Not hidden; if you look at the open group's m
Date:Thu, 9 Nov 2023 14:21:35 +0100
From:Mike Jonkmans
Message-ID: <20231109132135.ga208...@jonkmans.nl>
| If I am not mistaken, for POSIX compliance, both /bin and /usr/bin have
| to be in PATH (see quote from Robert).
No, I didn't say that, there are no partic
On Thu, Nov 09, 2023 at 10:12:06PM +0700, Robert Elz wrote:
> Date:Thu, 9 Nov 2023 14:21:35 +0100
> From:Mike Jonkmans
> Message-ID: <20231109132135.ga208...@jonkmans.nl>
>
> | If I am not mistaken, for POSIX compliance, both /bin and /usr/bin have
> | to be in PA
On 11/8/23 5:10 PM, Mike Jonkmans wrote:
Can this intrinsic list be amended with any user loaded builtins?
You mean enable -f? It's up to the shell implementation. Bash treats
dynamically-loaded builtins the same as any other builtin.
That was indeed what I meant.
Does the new POSIX version w
On 11/8/23 6:40 PM, Mike Jonkmans wrote:
On Wed, Nov 08, 2023 at 11:52:19PM +0700, Robert Elz wrote:
Date:Tue, 7 Nov 2023 23:04:10 +0100
From:Mike Jonkmans
Message-ID: <20231107220410.gc27...@jonkmans.nl>
| It makes sense to partition the builtins in three ca
On 11/9/23 8:21 AM, Mike Jonkmans wrote:
I see. Weirdly on Ubuntu 22.04, with /bin symlinked to /usr/bin,
`getconf PATH' produces `/bin:/usr/bin'.
That looks like a recipe for redundant `stats'.
Does that matter? The value getconf returns is static, and is guaranteed
to find all the standard u
On 11/9/23 11:17 AM, Mike Jonkmans wrote:
On Thu, Nov 09, 2023 at 10:12:06PM +0700, Robert Elz wrote:
Date:Thu, 9 Nov 2023 14:21:35 +0100
From:Mike Jonkmans
Message-ID: <20231109132135.ga208...@jonkmans.nl>
| If I am not mistaken, for POSIX compliance, both /
On Fri, Nov 10, 2023 at 08:07:31PM -0500, Chet Ramey wrote:
> On 11/9/23 11:17 AM, Mike Jonkmans wrote:
> > On Thu, Nov 09, 2023 at 10:12:06PM +0700, Robert Elz wrote:
> >
> > On Ubuntu 22.04 `getconf path' returns /bin:/usr/bin
> > and these are symlinked.
> Then that's an issue to take up with D
On Sat, Nov 11, 2023 at 09:14:41AM +0100, Mike Jonkmans wrote:
> On Fri, Nov 10, 2023 at 08:07:31PM -0500, Chet Ramey wrote:
> > On 11/9/23 11:17 AM, Mike Jonkmans wrote:
> > > On Thu, Nov 09, 2023 at 10:12:06PM +0700, Robert Elz wrote:
> > >
> > > On Ubuntu 22.04 `getconf path' returns /bin:/usr/
On Sat, Nov 11, 2023 at 08:31:14AM -0500, Greg Wooledge wrote:
> On Sat, Nov 11, 2023 at 09:14:41AM +0100, Mike Jonkmans wrote:
> > On Fri, Nov 10, 2023 at 08:07:31PM -0500, Chet Ramey wrote:
> > > On 11/9/23 11:17 AM, Mike Jonkmans wrote:
> > > > On Thu, Nov 09, 2023 at 10:12:06PM +0700, Robert El
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