1. UNIX/Linux Operating System
Haiyong Zheng

2. Contents
History and Hackers
UNIX-like Structure
Bourne Again SHell

3. Contents
History and Hackers
UNIX-like Structure
Bourne Again SHell

4. UNIX
Since 1969

5. Since 1965 GE-645 + => DEC PDP-7 Since 1969 Since 1971
MULTiplexed Information and Computing Service
General-Purpose
Time-Sharing
Multi-User +
=>
Batch Processing
Space Travel
DEC PDP-7
Since 1969
UNiplexed Information and Computing Service
Since 1971
DEC PDP-11/24
UNIX Memory: 12KB
2 Space Travel: 12KB
Memory: 24KB
Harddisk: 500KB
Since 1973
Assembly
3rd Kernel C
July 1974
5th UNIX
EduOnly

6. Minix=>Freax=>Linux
4.X BSD
System IV
System V
Since 1978
1992
POSIX
Linux
GNU
Minix=>Freax=>Linux
GNU’s Not Unix
Since 1991
Since 1984

8. 480 distros

9. Contents
History and Hackers
UNIX-like Structure
Bourne Again SHell

10. Version 7 UNIX PDP11 Filesystem Layout

12. Contents
History and Hackers
UNIX-like Structure
Bourne Again SHell

15. GNU/Linux Bash vim ssh RegEx grep sed awk … find sort xargs … pipeline
I/o redirection

16. UNIX Philosophy Small is beautiful.
Make each program do one thing well.
Build a prototype as soon as possible.
Choose portability over efficiency.
Store data in flat text files.
Use software leverage to your advantage.
Use shell scripts to increase leverage and portability.
Avoid captive user interfaces.
Make every program a filter.

17. Linus Torvalds
Really, I’m not out to destroy Microsoft. That will just be a completely unintentional side effect.
Software is like sex; it’s better when it’s free.
Talk is cheap. Show me the code.
Those that can, do. Those that can’t, complain.