Kristian Kvilekval:           http://www.cs.ucsb.edu/~kris/cs60
Office: 3158 Engr I DSL
Mail: kris@cs
Office hours:
Wed: 3-5  (CSIL)
Fri: 4-6  (CSIL)


Overview:
Questionaire
What's the deal with unix/C
Homework
Review of commands
Review of pathnames
Shells (what is it, why so many)
Wildcards 



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Unix


	Multiprocess:   
		(compare to multitasking) (compare to mutiprocessor)
	Robust (process/user protection)
	Interface for programs (how to a file, a connect to a computer, etc).
		(Posix, X/open)

	Where used?
		Internet, Companies (payroll, operations), 
		File servers, Workstations


 Windows, Mac  : How are they different, How are they similar?

	Single user
	Not protected
	Flakey

C 
   1. Basis of the unix operating.  
   2. THE language of industry.
   3. Used in Applications/Operating systems/networking.
   4. Efficient + Relatively portable.

C++
   1.  A better C
   2.  (Object oriented -- suitable for large projects)
   3.  Efficient

-------------------------------------------------------

Homework:

Hello World:

	Use xemacs to type in hello world
	$ xemacs hello.c

	Compile hello world
	$ gcc hello.c -o hello

	Run hello world
	$ hello


Vertical histogram of word lengths:

	Word length
	Saving data in array
	Printing vertically


Entab:
	Keeping track of position
	'       '      '	
	bbbbbbbbbbbhi
	t------>bbbhi

Detab:
	bbbbt-->t----->


-------------------------------------------------------
Commands:

cd, pwd, ls, cp, mv, echo, touch, rm, mkdir, du, df, sort, man, cal, xemacs
grep,fgrep, w, who, ps, which, uptime


Pathnames

Full Qualified  /, /bin/ /home/kris
Relative path   work, ./work, ../../work


Shell:
Origin of name?  
	Commands interpreter -- Interactive
	Program language (batch file?)

Lot's of shells:
	sh, csh, tcsh, ksh, bash


Commands (2)
	Shell commands + Programs
	Shell commands !Depends on Shell used!
	(set, cd, setenv, alias)

Adding new dirs to directory?


Wildcards:  (shell program)
	%ls *.sh
	%ls hmwk*
	%ls hmwk?
	%ls hmwk[0-9]


Commands?  What are they?

Input --> Processing --> Output

Keyboard --> Commands --> Screen


How about 
Keyboard --> Command --> File

Or

File --> command --> screen

Input/Output redirection

	% ls -1 > list
	% spell < resume.txt


Also allowed to tie program with a 'pipe'

command --> command --> screen

	%ls -1 | more
	%fgrep money account.txt | more


Job Control:

What goes in background 
(things that don't need the keyboard or screen RIGHT now)

Putting things in background 

	ctrl-Z then bg
	command &

Checking background jobs

	% jobs
	% ps

Forground (giving command control of keyboard and screen)
	% fg %1


Long running or uninteresting jobs 

	%rm -rf junk &

How about emacs or more (what happens)

	% emacs &