Re: Why does case-pattern undergo "process substitution"?

[Eric Pruitt]

On Sat, Aug 24, 2024 at 08:27:38AM +0000, shynur . wrote:
> > the behavior is easily confirmed.
> >
> > $ case <(:) in '<(:)') echo not expanded;; *) echo expanded;; esac
> > expanded
> 
> Indeed, despite the manual doesn't mention "process substitution":
> 
>     The _word_ undergoes tilde expansion, parameter expansion,
>     command substitution, arithmetic expansion, and quote
>     removal before matching is attempted.

You're quoting an old version of the man page. Documentation for Bash
5.2 reads:

 case word in [ [(] pattern [ | pattern ] ... ) list ;; ] ... esac

        [...] The word is expanded using tilde expansion, parameter and
        variable expansion, arithmetic expansion, command substitution,
        >>>process substitution<<< and [...]

That matches what Lawrence posted.

Eric