Re: process substitution in PROMPT_COMMAND

[Curtis Doty]

On Sun, 7 Aug 2011, Chet Ramey wrote:

> On 8/7/11 6:00 PM, Curtis Doty wrote:
> >   local job jobcount=0
> >   while read job
> >   do ((jobcount++))
> >   done < <(jobs)
>
> As you suspect, the problem is with this part of the function.  It doesn't
> really have anything to do with PROMPT_COMMAND, though.  You must be
> exporting the function so your PROMPT_COMMAND will work in interactive
> subshells, and the problem is there.

Aha, indeed I have this too:

  export -f foo

Removing it and the error goes away on successive subshells. :-)

I already export PROMPT_COMMAND=foo. Maybe I don't need to try and 
re-export the function every time also?

> >   bash: foo: line 39: syntax error near unexpected token `('
> >   bash: foo: line 39: ` done <<(jobs);'
> >   bash: error importing function definition for `foo'
> >
> > Am I missing a finer point of redirection from a substituted process? Or is
> > something different in bash 3 that I need to work around here?
>
> One of the bugs fixed between bash-3.1 and bash-3.2 concerned formatting
> problems with redirections and process substitution -- the construct you
> used.  That code is used to decompose functions to pass them through the
> environment, and the incorrectly-formed function has a syntax error that
> prevents it being imported by the subshell.
>
> Chet

Thanks Chet! I'll chalk this up as an old bug already fixed.

../C