Deck 3: Unix Commands and Functions: Part B

Question 1

On executing a statement set -3+1

A)$1 would be -3
B)$1 would be -
C)$1 would be set
D)this command would result into an error

Answer 1

this command would result into an error

Question 2

On executing the command Shift $v

A)the positional parameters would be shifted by the value of the variable v
B)the positional parameters would be shifted by 1
C)the positional parameters would not be shifted at all
D)this command would result into an error

Answer 2

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

Question 3

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

A)(),**,* or /, + or -
B)(), **, *,/,+,-
C)(),**,/,*,+,-
D)(),/,% or *,- or +

Answer 3

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

Question 4

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

A)[]
B){}
C)()
D)none of the above

Question 5

The statement z='expr 5/2' would store in z a value

A)2.5
B)3
C)2
D)0

Question 6

The expression expr -7 % 2evaluates to

A)1
B)-1
C)-3.5
D)0

Question 7

The expression expr -2 % 7 evaluates to

A)2
B)-2
C)0
D)0.285

Question 8

Hierarchy decides which operator

A)is most important
B)is used first
C)is fastest
D)operates on largest numbers

Question 9

The break statement is used to exit from

A)an if statement
B)a for loop
C)a program
D)none of the above

Question 10

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

A)only once
B)atleast once
C)not even once
D)none of the above

Question 11

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

A)-m.n
B)+m.n
C)+n.m+1
D)+(m+1).n

Question 12

Which command is used to terminate a process

A)shutdown
B)haltsys
C)cancel
D)kill

Question 13

The command is used to compare the files is known as

A)comp
B)cmp
C)do
D)ccp

Question 14

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

A)tee
B)tr
C)sort
D)grep

Question 15

Which command is used to remove a directory

A)rd
B)rmdir
C)dldir
D)rdir

Question 16

Which of the following keys is used to replace a dingle character with new text

A)s
B)s.
C)r
D)c

Question 17

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

A)cat
B)cut
C)grep
D)paste

Question 18

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

A)wcinfile>newfile
B)wcnewfile
C)wcinfile - newfile
D)wcinfile | newfile

Question 19

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

A)chmodgo+r note
B)chmodgo+rw note
C)chmod go-x note
D)chmod go-r, 4-x note

Question 20

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

A)cat emp[!0-9]
B)more [emp][!0-9]
C)cat emp[x-z]
D)cat emp[a-z]

Question 21

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

A)s
B)S
C)a
D)i

Question 22

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

A):pat.
B):pat
C)/pat
D)all of the above

Question 23

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

A)$!
B)$#
C)$0
D)$*

Question 24

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

A)-4
B)-f
C)-1
D)-4.

Question 25

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

A)write
B)mail
C)wall
D)mesg