>From the manual:
wait [-fn] [-p varname] [id ...]
Wait for each specified child process and return its termination
status. Each id may be a process ID or a job specification; if a job
spec is given, all processes in that job's pipeline are waited for. If
id is not given, wait waits for all running background jobs and the
last-executed process substitution, if its process id is the same as
$!, and the return status is zero. [...]
Why do this? Why not just wait for all process substitutions?
If I do something like
command-1 | tee >( command-2 ) >( command-3 ) >( command-4 )
with 'shopt -s lastpipe', how do I get the pids for the three process
substitutions that all just got forked at the same time? Only one is
going to show up in ${!}. I can't explicitly wait for the pids of all
three of them if I can't get them all in the first place.
Zack
