You learned in class how to use a named pipe (aka FIFO) and the netcat (nc) program to turn mdb-lookup-cs3157 into a network server.

mkfifo mypipe cat mypipe | nc -l some_port_num | /some_path/mdb-lookup-cs3157 > mypipe

Write a shell script that executes the pipeline.

- The name of the script is "mdb-lookup-server-nc.sh"

- A shell script starts with the following line (the '#' is the 1st character without any leading space):

#!/bin/sh

And the line must be the VERY FIRST LINE in the script.

- You must make the file executable using "chmod" command.

- The script takes one parameter, port number, on which nc will listen.

- The script should create a named pipe named mypipe-, where indicates the process ID of the shell running the script. The named pipe should be removed at the end of the script.

- See section 3.4 in the Bash Reference Manual (http://www.gnu.org/software/bash/manual/bashref.html) for how to refer to the arguments and the process ID from your script.

- Because the named pipe gets removed only at the end of the script, if you quit out of the script by hitting Ctrl-C while it's running, the FIFO will not get removed. This is ok. You can manually clean up the FIFOs in the directory. If this annoys you, you can optionally add the following lines to your script after the first line:

on_ctrl_c() { echo "Ignoring Ctrl-C" }

# Call on_ctrl_c() when the interrupt signal is received. # The interrupt signal is sent when you press Ctrl-C. trap on_ctrl_c INT