I am currently rewriting my Korn shell scripts in perl (who said an old dog can't learn new tricks) and would like to know the best way to re-write ksh co-process handling.
For example how could the following example be best re-written? 
# Open co-process
co_process_program |&
while read -p output
do
    if ((input_required == true))
    then
        input="just do some work";
        print -p $input;
    fi

    if [[ $output = +(*done*) ]]
    then
        input="do something else";
        print -p $input;
    fi

    if [[ $output = +(*finished*) ]]
    then
        input="time to go";
        print -p $input;
        break;
    fi
done

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In reply to co-processes by Jonathan

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