Thorsten Glaser wrote:
> apparently (from a #grml discussion in IRC), zsh has two:
>
> <(…) uses /dev/fd (or pipes, I guess)
> =(…) uses temporary files (to aid applications to lseek on it)
>
> Maybe we should just take on the latter (reuse the heredoc
> infrastructure) and make it available as <(…) (since nobody
> even knows about =(…) and so it's pointless)?
A common use of <(...) is to parse output from a command and let it
influence the current environment:
while read key value
do
if test "$key" = thegoodone
then
val=$value
break
fi
done < <(producer)
The "producer" command here could produce a potentially infinite
stream of output.
The application that led me to mention process substitution to you
also involved concurrent processes.
producer |
tee >(xz >log.xz) |
consumer
Hope that helps,
Jonathan
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