Unix Operating System Set 3 MCQs

Q1 | On executing a statement set -3+1

$1 would be -3

$1 would be –

$1 would be set

this command would result into an error

Q2 | On executing the command Shift $v

the positional parameters would be shifted by the value of the variable v

the positional parameters would be shifted by 1

the positional parameters would not be shifted at all

this command would result into an error

Q3 | Which of the following shows the correct hierarchy of arithmetic operations in shell

(),**,* or /, + or –

(), **, *,/,+,-

(),**,/,*,+,-

(),/,% or *,- or +

Q4 | Which of the following is allowed in an arithmetic statement involving exprinstruction

[]

{}

()

none of the above

Q5 | The statement z=’expr 5/2’ would store in z a value

2.5

3

2

Q6 | The expression expr -7 % 2evaluates to

1

-1

-3.5

Q7 | The expression expr -2 % 7 evaluates to

2

-2

0.285

Q8 | Hierarchy decides which operator

is most important

is used first

is fastest

operates on largest numbers

Q9 | The break statement is used to exit from

an if statement

a for loop

a program

none of the above

Q10 | An until loop ensures that the statement within the loop get executed

only once

atleast once

not even once

none of the above

Q11 | Which option will be used with sort command to start sorting after the nth column of the (m+1)th field

–m.n

+m.n

+n.m+1

+(m+1).n

Q12 | Which command is used to terminate a process

shutdown

haltsys

cancel

kill

Q13 | The command is used to compare the files is known as

comp

cmp

do

ccp

Q14 | The command which transcribes the standard input to the standard output and also makes a copy of the same in a file is

tee

tr

sort

grep

Q15 | Which command is used to remove a directory

rd

rmdir

dldir

rdir

Q16 | Which command is used to extract a specific columns from the file

cat

cut

grep

paste

Q17 | Which command sends the word count of the file infile to the newfile.

wcinfile>newfile

wcnewfile

wcinfile - newfile

wcinfile | newfile

Q18 | Which command is used to remove the read permission of the file 'note' from both the group and others?

chmodgo+r note

chmodgo+rw note

chmod go-x note

chmod go-r, 4-x note

Q19 | Which command is used to concatenate all files beginning with the string 'emp' and followed by a non-numeric characters?

cat emp[!0-9]

more [emp][!0-9]

cat emp[x-z]

cat emp[a-z]

Q20 | Which command will be used with vi editor to insert text to left of cursor?

s

a

i

Q21 | In vi editor, forward search is performed using the command.

:pat

/pat

all of the above

Q22 | Which of the following special shell variables is used to process number of the last background job?

$!

$#

$0

$*

Q23 | Which option will be used with ps command to slow the entire command line of the process being run?

-4

-f

-1

-4

Q24 | Which of the following command addresses all users who are currently hooked on?

write

mail

wall

mesg