Shell Programming and Scripting

Before I begin with the question, I just want to point out that I just started learning unix in the middle of last week, so my code (and knowledge of how unix operates) is weak sauce. I took my best stab at this question but it's just not working.

Assignment:
Create a script named 'userprocesses' which will allow you to find all users currently logged on to the system and display the processes they are running. The heading for each user must be their real name not their log in name.
I.e. my login name is lee.ballancore but my real name is Lee Ballancore
The users must not be displayed more than once. DO NOT USE AWK OR SED.
The output should look similar to this.

Lee Ballancore
PID TTY TIME CMD
31799 pts/3 00:00:00 vim
31866 pts/3 00:00:00 vim
2495 pts/7 00:00:00 vim
8368 pts/0 00:00:00 vim
9544 pts/2 00:00:00 ps

Alistairr Rutherford
PID TTY TIME CMD
8368 pts/0 00:00:00 vim
9544 pts/2 00:00:00 ps

Write the output to a file.
-------------------------------------------------

So I spent all day messing around with it, and here's the code I wrote up:

Code:

#!/bin/bash

finger > fingers
a=wc -l fingers
b=0

username=$(finger | cut -d ' ' -f1)
fullname=$(grep $username /etc/passwd | cut -d : -f5) >name
ps -au $username > process


until [ $a -eq $b ]; do
   cat name | cat - process
   a=$a - 1
done

This is not the forum thread for homework.
Take a look here and use the proper procedure.
https://www.unix.com/homework-coursew...ons-forum.html