Review

Question 1

System calls can be grouped into 5 categories :

Answer 1

1. Process Control
2. File Manipulation
3. Device Manipulation
4. Information Maintenance
5. Communications

Question 2

What is Linux ?

Answer 2

Linux is a multiuser, multitasking operating system

Question 3

System Calls vs. Library Calls
What is the library call for the system call open?

Answer 3

LIBRARY CALL:
fopen

Question 4

System Calls vs. Library Calls
What is the library call for the system call close?

Answer 4

LIBRARY CALL:
fclose

Question 5

System Calls vs. Library Calls
What is the library call for the system call read?

Answer 5

LIBRARY CALL:
fread, getchar, scanf, fscanf, getc, fgetc, gets, fgets

Question 6

System Calls vs. Library Calls
What is the library call for the system call write?

Answer 6

LIVRARY CALLS:
fwrite
putchar
printf
fprintf
putc
fputc
puts
fputs

Question 7

System Calls vs. Library Calls
What is the library call for the system call lseek ?

Answer 7

LIBRARY CALL:
fseek

Question 8

How is the OS structured ?

Question 9

OS Design Issues
How are things shared ?

Question 10

OS Design Issues
How are things named ?

Question 11

OS Design Issues
How is protection handled ?

Question 12

OS Design Issues
What about security ?

Question 13

OS Design Issues
What about performance what makes something slow ?

Question 14

OS Design Issues
What happens during a fault ?

Question 15

OS Design Issues
How do we extend the OS?

Question 16

OS Design Issues
How is information exchanged ?

Question 17

OS Design Issues
How do we handle concurrency ?

Question 18

OS Design Issues

Answer 18

-Scale/ Growth
-Persistence
-Compatibility
-Distribution
-Accounting

Question 19

What are regular expressions ?

Question 20

How are regular expressions different from globing ?

Question 21

What does SED stand for ?

Question 22

How do you write single line sed commands ?

Question 23

How do you write sed scripts?

Question 24

The sed command

Answer 24

sed options script(or command) file list

Remeber options:
-n : no automatic output
-e : inline script
-f : in-file script

Question 25

What is a script ?

Answer 25

A script is nothing more than a file of commands
Each command consists of an address and an action, where the address can be a regular expression or line number

Question 26

SED COMMANDS
What is the sed command for substitute ?

Answer 26

S

Question 27

SED COMMANDS
What is the sed command for append ?

Answer 27

a

Question 28

SED COMMANDS
What is the sed command for insert ?

Answer 28

i

Question 29

SED COMMANDS
What is the sed command for change ?

Answer 29

c

Question 30

SED COMMANDS
What is the sed command for delete?

Answer 30

d

Question 31

SED COMMANDS
What is the sed command for print ?

Answer 31

p

Question 32

SED COMMANDS
What is the sed command for read ?

Answer 32

r

Question 33

SED COMMANDS
What is the sed command for write?

Answer 33

w

Question 34

SED COMMANDS
What is the sed command for transform ?

Answer 34

y

Question 35

SED COMMANDS
What is the sed command for display line number ?

Answer 35

=

Question 36

SED COMMANDS
What is the sed command for append next line to current one ?

Answer 36

N

Question 37

SED COMMANDS
What is the sed command for quit?

Answer 37

q

Question 38

GAWK
A Gawk program consists of :

Answer 38

-An optional BEGIN segment
+For processing to execute prior to reading input
-Pattern - Action Pairs
+Processing for input data
+For each pattern matched, the corresponding action is taken
-An optional END segment
+ Processing after end of input data