Making a Stack
Initial stack:
  awk bash chmod 
Push item on stack:
  awk bash chmod diff 
Push item on stack:
  awk bash chmod diff Emacs 
Popping top of stack:  Emacs
Final stack:
  awk bash chmod diff 

Making a "First In First Out" Queue
Initial queue:
  lpr mcopy ps 
Add item to queue:
  kill lpr mcopy ps 
Add item to queue:
  df kill lpr mcopy ps 
Remove FIFO item: ps
Final queue:
  df kill lpr mcopy 

Making Linked Lists
Initial Values
0.  vi   	 Null
1.  emacs	 Null
2.  joe  	 Null


Made Links
0.  vi   	 2
1.  emacs	 Null
2.  joe  	 1


Traversing list:
vi    
joe   
emacs 


Using Pointers
Before:  SCALAR(0x80d2168)  finger Null ->  finger 2 
Before:  SCALAR(0x80d2174)  whois Null ->  whois Null 
Before:  SCALAR(0x80d2180)  who Null ->  who 1 

finger:2 whois:Null who:1

Traversing list:
finger
who
whois


Using a Hash
Traversing list:
man  Get UNIX Help 
more  Page Through Files 
cat  Display Files