Basics of Linux Online Exam

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1. What is sed?

a non-interactive stream editor

an IDE

a hex editor

none of the mentioned

2. Functions improves the shell’s programmability significantly, because :

when we invoke a function, it is already in the shell’s memory, therefore a function runs faster than seperate scripts

function provides a piece of code for repetative tasks

both (a) and (b)

none of the mentioned

3. Maximum how long can a Linux filename be ?

128 bytes

255 bytes

32 bytes

64 bytes

4. Which command is used to re execute the previous command?

!cat

5. ‘kill %s’ command will :

terminate the last job

terminate the job whose command line starts with s

terminate the first job

none of the mentioned

6. The permission -rwxr-xr-t represented in octal expression will be :

0777

1755

1754

2754

7. Which expression use the value of the enclosed arithmetic expression?

$()

$(())

${}

$[]

8. The major number identifies the _____ associated with the device :

port

driver

protocol

none of the above

9. The signal sent to a process when the Ctrl-C key is pressed is :

INT

TERM

TSTP

KILL

10. What is job number?

same as PID

a unique number, assigned to each job in shell

both (a) and (b)

none of the mentioned

11. In we use a driver for N number of files, then we have to create ____ device files.

N-1

none of the mentioned

12. Which one of the following is not true?

there are 3 types of constant expressions: numeric, string and regular

arithmetic operators are used to evaluate expressions

assignment expression is an expression that stores a value into a variable

comparison expressions does not compare strings for relationship

13. Given the command :

sets write permission to everyone for datafile

sets write permission to others for datafile

clears write permission to everyone for datafile

clears write permission to others for datafile

14. All numeric values are represented within awk in

double precision floating point

integer

exponential notation

fixed point

15. nohup is used to :

automatically hang up the process after logout

continue the process after logout

create backgroung process

manually hang up the process after logout

16. Which command terminates a running process by name of the process?

kill

pkill

killall

fkill

17. Which option is used by sed to specify that the following string is an instruction or set of instructions?

-e

-f

-i

-n

18. If a and b are 2 variables then the meaning of a<<=b is a) b = a << b b) a = a << b c) b = b << a d) a = a << b [expand title="View Answer"] Answer:b Explanation:None. [/expand] 4. Which one of the following is bitwise 'exclusive or' operator? a) ^= b) |= c) != d) none of the mentioned [expand title="View Answer"] Answer:a Explanation:None. [/expand] 5. Which one of the following is not a valid operator in bash shell? a) || b) ~ c) =<< d) -= [expand title="View Answer"] Answer:c Explanation:None. [/expand] 6. What is the output of this program?

19. Which command will delete all the blank lines in file old.txt?

sed ‘/d’ old.txt

sed ‘/^/d’ old.txt

sed ‘/^$/d’ old.txt

sed ‘/^*/d’ old.txt

20. Which one of the following algorithm is not used in asymmetric-key cryptography?

RSA algorithm

diffie-hellman algorithm

electronic code book algorithm

none of the mentioned

21. What is expression in awk programming?

expression evaluates a value to print, test or pass to a function

expression assigns a new value to a variable or field

both (a) and (b)

none of the mentioned

22. Which of these commands will set the permissions on file textfile to read and write for the owner, read for the group, and nothing for everyone else?

chmod 046 textfile

chmod 640 textfile

chmod 310 textfile

chmod rw r nil textfile

23. In linux, a device driver can work without the :

major number

minor number

device file name

none of the mentioned

24. Ctrl-Z key combination :

generates a SIGINT signal

stops the process running in the shell

kills the process running in the shell

both (a) and (c)

25. If you are a root user, how can you grand execute permission only for the owner of the file project1?

chmod U+X project1

chmod u+x project1

chmod a+x project1

26. Which command allows to view the current jobs being handled by the shell?

view

jobs

show

draw

27. Concatenation is performed by :

writing expressions next to one another, with no operator

conditional operator

relational operator

matching operator

28. A user issues the following command sequence:

The second a.out process is also terminated

The second a.out process becomes a defunct process

The first a.out process becomes a zombie process

init process becomes parent of second a.out process

29. When the return value of any function is not specified within the function, what function returns?

nothing

exit status of the last command executed

none of the mentioned

30. Which command is used to bring the background process to forground?

background

forground

Exam Name:	Linux
Subject / Discipline:	Operating Systems / Computer / Software
Exam Type:	Multiple Choice Questions
Total Questions:	30
Pass Percentage	50%
Time:	20 Minutes
Level:	BS / M.Sc / College

Basics of Linux Online Exam

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