how to go back into the command line from a code

So I wrote a code, and once a function is done, I need part of the code to open up terminal, and execute a command through terminal. How would I do this?Edit: I need my javascript program to go back into terminal and execute the command ' cat /Users/User/Documents/address.zpl | nc 10.10.102.100 9100 '

Submitted March 28, 2016 at 01:47AM by going_Grad