shell - Check if there are any running processes in the current tab of terminal -

i have script opens many terminal tabs devices plugged in, runs tests on devices. clean terminal tabs after tests done. run things in background, , don't know when each process done.

how can check if there process running in current tab of terminal?

i plan command w in applescript kill each terminal command after each tab of terminal has no running processes.

thanks!

if use applescript, can check busy property:

tell application "terminal"     repeat t in tabs of windows         if busy of t false             script "exit" in t         end if     end repeat end tell 

exit closes tab if set "preferences > settings > shell > when shell exits" "close window".