Re: Call dynamic builtins with 'builtin' command

[Chet Ramey]

On 10/9/24 7:15 AM, Vadim Nevorotin wrote:
> Hello!
>
> I'm trying to do a very simple task: I want to use the 'stat' builtin
> from BASH_LOADABLES_PATH without overwriting the current behavior of
> the 'stat' command in the current shell (whether it's a binary from
> $PATH, or an alias, or a function).

So you want it to override an executable file, since adding a loadable
builtin doesn't change the search order, and aliases and shell functions
are found before builtins.

> This does not work:
>
> $ builtin stat
> bash: builtin: stat: not a shell builtin
>
> According to 'help enable' this should work, but it also do not:
>
> $ enable stat
> $ enable -n stat
> $ builtin stat
> bash: builtin: stat: not a shell builtin

I'm not sure what you expect -- you just disabled the builtin you loaded,
so it won't be used.

> 'enable -n' should just disable stat, according to 'help enable', but
> it looks like it also removes it.

Why should it not? You'll have to enable it again before you use it, which
will load it again.

> So:
> 1. At least the help for 'enable' should be fixed, but there is
> definitely a bug in enable+builtin usage for dynamic builtins.

What is the bug?

> 2. Can you explain how to load and use e.g. stat builtin without
> overwriting the current behavior of stat in the whole existing script?

Is this anything more complicated than doing

enable it
use it
disable it

Chet

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/

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