Re: BASH_COMMAND does not expand correctly in subshells inside traps.

[Chet Ramey]

On 11/4/21 5:49 PM, Emanuele Torre wrote:

> Bash Version: 5.1
> Patch Level: 8
> Release Status: release
>
> Description:
>    BASH_COMMAND does not expand to the expected value when used in a
>    subshell inside a trap.

This is a variant of

https://lists.gnu.org/archive/html/help-bash/2021-10/msg00269.html

In this case, as explained in the above message, the subshell `forgets'
that it's executing as part of the DEBUG trap. Since we're not in the
DEBUG trap, the value of BASH_COMMAND doesn't get updated. As a
consequence, since the expansion of the command happens in the subshell,
the original value (unexpanded in the parent shell) remains.

I think I might have to rethink this strategy. What do you think?

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/