Re: waiting for process substitutions

[Greg Wooledge]

On Mon, Jul 08, 2024 at 22:45:35 +0200, alex xmb sw ratchev wrote:
> On Mon, Jul 8, 2024, 22:15 Chet Ramey <chet.ramey@case.edu> wrote:
> 
> > On 7/8/24 4:02 PM, alex xmb sw ratchev wrote:
> >
> > > hi , one question about ..
> > > if a cmd contains more substitions like >( or <( , how to get all $!
> > > maybe make ${![<cmdnum>]} , or is such already .. ?
> >
> > You can't. Process substitutions set $!, but you have to have a point
> > where you can capture that if you want to wait for more than one. That's
> > the whole purpose of this thread.
> >
> 
> so no ${![2]} or so ?
> else i see only half complex start_first stuff
> 
> anywa .. greets  = ))

Bash has nothing like that, and as far as I know, nobody is planning to
add it.

If you need to capture all the PIDs of all your background processes,
you'll have to launch them one at a time.  This may mean using FIFOs
(named pipes) instead of anonymous process substitutions, in some cases.