What kind of client are you going to expect users to use? If you want to allow the use of telnet or ssh type clients, and you want the user to see the output of the bash script, then the easiest solution for a Linux/FreeBSD box is to add a new user to the system, and make the bash script their default shell. If it's a custom client and server that is only going to fire off the script, then you can use the socket interface.