Supervisor
Multi user
Single user
Super user
Baby shell
Junior shell
Child shell
Assistant shell
Dennis Ritchie
Linus Torvalds
Ken Thompson
Prof. Andrew S. Tannenbaum
1.0
0.11
1.01
0.10
Login screen
Internet
Logout screen
Login prompt
first hard drive
first partition
second partition
second hard drive
Ctrl+ V
Ctrl+ B
Ctrl+ D
Ctrl+ C
Change directory
Created directory
Current directory
Parent directory
System Advisor
System coordinator
System Manager
System Administrator
Everyone
SA
End-user