See the "wait" builtin command ("help wait" in bash). You could do

Code:

#! /bin/bash

# Using sleeps for an example, obviously this isn't what my script will do

sleep 100 &
sleep 200 &  # <- this is the process I want in the foreground but must be run BEFORE the next line
sleep 300 &

jobs -l  # For demonstration purposes only

wait %2

I don't think this is normally possible without being a debugger. However, it is possible to use screen to attach login sessions to different terminals. But based on what else you described, I don't think that's possible.

It might be in theory possible to use gdb to attach to a process and run a script of debugging commands, such as "b exit(); c ; p value[2]"