Which of the following is not true about awk arrays?

they are initialized to zero or an empty string

they are not expanded automatically

they are initialized to zero or an empty string

Context switch changes the process mode from

kernel mode to the kernel process

The output of the following command will be:$ uniq foo1 foo2

process foo1 and output is stored in foo2

Which of the following will be used to print lines containing ‘manager’ in emp.lst?

awk ‘/manager { print }’ emp.lst

awk ‘/manager/ { print }’ emp.lst

awk ‘/manager { print }’ emp.lst

awk ‘/manager/ { print } emp.lst

awk ‘manager { print }’ emp.lst

Which one of the following commands is incorrect?

$ cut -d “|” -f 1,4 emp.lst

Case functions are used for

Changing lowercase to uppercase

176 + Mcqs in Regular Expressions in Python Page 2 McqOptions

51.	___ function is used for joining lists.
A.	foreach
B.	for
C.	split
D.	join
Answer» E.

Discussion

52.	___ is known as range operator.
A.	. .
B.	$1
C.	$.
D.	$_
Answer» B. $1

Discussion

53.	The command @x=(1. .10) will assign first ten integer values to the array ‘a’.
A.	True
B.	False
C.	May be
D.	Can't say
Answer» B. False

Discussion

54.	For deleting the elements from the right of the array ___ function is used.
A.	pop
B.	push
C.	queue
D.	shift
Answer» B. push

Discussion

55.	Which function can combine the functionalities of push, pop, unshift and shift?
A.	splice
B.	add
C.	delete
D.	split
Answer» B. add

Discussion

56.	To add elements to the right side of the array ____ function is used.
A.	pop
B.	push
C.	queue
D.	unshift
Answer» C. queue

Discussion

57.	File x .c has 5 lines of code. The commanddate l tee abc l sort - x. c l wc -1, displays
A.	5
B.	6
C.	0
D.	an error message
Answer» C. 0

Discussion

58.	For looping in a list, ____ is used.
A.	for
B.	fordo
C.	foreach
D.	while
Answer» B. fordo

Discussion

59.	awk doesn’t use $ in evaluation or assignment of variables.
A.	True
B.	False
C.	may be
D.	Can't say
Answer» B. False

Discussion

60.	Which option is used for storing awk programs in a file?
A.	-e
B.	-f
C.	-i
D.	-h
Answer» B. -f

Discussion

61.	awk supports the use of arrays.
A.	True
B.	False
C.	May be
D.	Can't say
Answer» B. False

Discussion

62.	Which of the following is not true about awk arrays?
A.	they are not expanded automatically
B.	they are initialized to zero or an empty string
C.	index can be a string also
D.	they are not formally defined
Answer» B. they are initialized to zero or an empty string

Discussion

63.	Which function is used by perl for displaying the length of a string?
A.	string
B.	len
C.	split
D.	length
Answer» E.

Discussion

64.	___ function returns the first occurrence of a character in a string.
A.	string
B.	index
C.	split
D.	length
Answer» C. split

Discussion

65.	We cannot perform sorting on columns using sort command.
A.	True
B.	False
C.	May be
D.	Can't say
Answer» C. May be

Discussion

66.	Context switch changes the process mode from
A.	user to kernel mode
B.	kernel to user mode
C.	kernel mode to the kernel process
D.	Both (a) and (b)
Answer» E.

Discussion

67.	awk uses _____ dimensional arrays.
A.	one
B.	two
C.	multi
D.	three
Answer» B. two

Discussion

68.	The ___ prefix to an array name signifies the last index of the array.
A.	$0
B.	$#
C.	#$
D.	$_
Answer» C. #$

Discussion

69.	Which of the following is referred to as default variable?
A.	$0
B.	$1
C.	$!
D.	$_
Answer» E.

Discussion

70.	A user-defined variable is initialized to ____
A.	zero
B.	zero or null string
C.
D.	operator
Answer» C.

Discussion

71.	___ operator is used for selecting current line number.
A.	$0
B.	$1
C.	$.
D.	$_
Answer» B. $1

Discussion

72.	The printf function uses ___ for string data and ___ for numeric.
A.	%f, %l
B.	%s, %f
C.	%s, %d
D.	%s, %s
Answer» D. %s, %s

Discussion

73.	head -n 3 emp.lst \| tr ‘[a-z]’ ‘[A-Z]’Above command will change the case of text from lower to upper.
A.	True
B.	False
C.	May be
D.	Can't say
Answer» B. False

Discussion

74.	______ option is used for compressing multiple consecutive characters.
A.	-d
B.	-c
C.	-n
D.	-s
Answer» E.

Discussion

75.	The output of the following command will be:$ uniq foo1 foo2
A.	erroneous
B.	output stored in foo2
C.	concatenates both files
D.	process foo1 and output is stored in foo2
Answer» E.

Discussion

76.	To perform context addressing, we have to enclose the pattern in ____
A.	double quotes
B.	single quotes
C.	/ /
D.	$ $
Answer» D. $ $

Discussion

77.	The following command will match the lines beginning with ‘2’.$ grep “^2” emp.lst
A.	True
B.	False
C.	May be
D.	Can't say
Answer» B. False

Discussion

78.	The following command will match ‘Agarwal’, ‘agarwal’ and ‘agrawal’.$ grep “[aA]g[ar][ar]wal” emp.lst
A.	True
B.	False
C.	May be
D.	Can't say
Answer» B. False

Discussion

79.	If there are special characters in a pattern, then we’ve to enclose them in ______
A.	single quotes
B.	double quotes
C.	without any quotes
D.	all quotes
Answer» C. without any quotes

Discussion

80.	perl is ____ of grep, tr, sed and awk.
A.	subset
B.	superset
C.	child
D.	parent
Answer» C. child

Discussion

81.	Which of the following will be used to print lines containing ‘manager’ in emp.lst?
A.	awk ‘/manager/ { print }’ emp.lst
B.	awk ‘/manager { print }’ emp.lst
C.	awk ‘/manager/ { print } emp.lst
D.	awk ‘manager { print }’ emp.lst
Answer» B. awk ‘/manager { print }’ emp.lst

Discussion

82.	For deleting the elements from the left of the array ___ function is used.
A.	pop
B.	push
C.	queue
D.	shift
Answer» E.

Discussion

83.	To repeat a string, perl uses ___ operator.
A.	/
B.	.
C.	x
D.	\\
Answer» D. \\

Discussion

84.	____ function breaks up a string on the basis of delimiter.
A.	length
B.	substr
C.	system
D.	split
Answer» E.

Discussion

85.	Which of the following are concatenation operators?
A.	/
B.	.
C.	_
D.	\\
Answer» E.

Discussion

86.	The command $ sed -n ‘$p’ emp.lst will display the last line.
A.	True
B.	False
C.	May be
D.	Can't say
Answer» B. False

Discussion

87.	Which of the following is an associative array?
A.	a[ ]
B.	arr[ ]
C.	envr [ ]
D.	ENVIRON[ ]
Answer» E.

Discussion

88.	We can specify filenames in command line using perl.
A.	True
B.	False
C.	May be
D.	Can't say
Answer» B. False

Discussion

89.	The following will display :perl -e ‘print “UNIX” x 10 . “\n” ;’
A.	UNIX
B.	UNIX 10 times
C.	error message
D.	\n
Answer» C. error message

Discussion

90.	____ section can be used if we’ve to print something after processing the last line.
A.	end
B.	begin
C.	start
D.	first
Answer» C. start

Discussion

91.	Perl also supports use of for loop in the following manner.for($i=0;$i<3;$i++){ }
A.	True
B.	False
C.	May be
D.	Can't say
Answer» B. False

Discussion

92.	awk uses ___ operator for concatenating strings.
A.	>
B.	\|
C.	*
D.	no operator available
Answer» E.

Discussion

93.	To add elements to the left side of the array ____ function is used.
A.	pop
B.	push
C.	queue
D.	unshift
Answer» E.

Discussion

94.	sqroot(x) function returns the square root of x.
A.	True
B.	False
C.	May be
D.	Can't say
Answer» C. May be

Discussion

95.	____ section can be used if we’ve to print something before processing the first line.
A.	end
B.	begin
C.	start
D.	first
Answer» C. start

Discussion

96.	The following command will produce an error.$ cut -d “\|” -f 1,4 emp.lst
A.	True
B.	False
C.	May be
D.	Can't say
Answer» C. May be

Discussion

97.	Which one of the following commands is incorrect?
A.	$ cut -d “\|” -f 1,4 emp.lst
B.	$ cut -c -3 emp.lst
C.	$ tail -c -511 foo
D.	$ tail -c 500 foo
Answer» E.

Discussion

98.	Which function is identical to Strstr ( )?
A.	Strlen ( )
B.	Strchar ( )
C.	Strcmp ( )
D.	None of them
Answer» C. Strcmp ( )

Discussion

99.	Process of breaking up a long string into words is called as
A.	Stroking
B.	Delimiters
C.	Tokenizing
D.	Parsing
Answer» D. Parsing

Discussion

100.	Case functions are used for
A.	Changing lowercase to uppercase
B.	Changing the length of string
C.	String replacement functions
D.	Searching functions
Answer» B. Changing the length of string

Discussion

Explore topic-wise MCQs in Python.

___ function is used for joining lists.

___ is known as range operator.

The command @x=(1. .10) will assign first ten integer values to the array ‘a’.

For deleting the elements from the right of the array ___ function is used.

Which function can combine the functionalities of push, pop, unshift and shift?

To add elements to the right side of the array ____ function is used.

File x .c has 5 lines of code. The commanddate l tee abc l sort - x. c l wc -1, displays

For looping in a list, ____ is used.

awk doesn’t use $ in evaluation or assignment of variables.

Which option is used for storing awk programs in a file?

awk supports the use of arrays.

Which of the following is not true about awk arrays?

Which function is used by perl for displaying the length of a string?

___ function returns the first occurrence of a character in a string.

We cannot perform sorting on columns using sort command.

Context switch changes the process mode from

awk uses _____ dimensional arrays.

The ___ prefix to an array name signifies the last index of the array.

Which of the following is referred to as default variable?

A user-defined variable is initialized to ____

___ operator is used for selecting current line number.

The printf function uses ___ for string data and ___ for numeric.

head -n 3 emp.lst | tr ‘[a-z]’ ‘[A-Z]’Above command will change the case of text from lower to upper.

______ option is used for compressing multiple consecutive characters.

The output of the following command will be:$ uniq foo1 foo2

To perform context addressing, we have to enclose the pattern in ____

The following command will match the lines beginning with ‘2’.$ grep “^2” emp.lst

The following command will match ‘Agarwal’, ‘agarwal’ and ‘agrawal’.$ grep “[aA]g[ar][ar]wal” emp.lst

If there are special characters in a pattern, then we’ve to enclose them in ______

perl is ____ of grep, tr, sed and awk.

Which of the following will be used to print lines containing ‘manager’ in emp.lst?

For deleting the elements from the left of the array ___ function is used.

To repeat a string, perl uses ___ operator.

____ function breaks up a string on the basis of delimiter.

Which of the following are concatenation operators?

The command $ sed -n ‘$p’ emp.lst will display the last line.

Which of the following is an associative array?

We can specify filenames in command line using perl.

The following will display :perl -e ‘print “UNIX” x 10 . “\n” ;’

____ section can be used if we’ve to print something after processing the last line.

Perl also supports use of for loop in the following manner.for($i=0;$i<3;$i++){ }

awk uses ___ operator for concatenating strings.

To add elements to the left side of the array ____ function is used.

sqroot(x) function returns the square root of x.

____ section can be used if we’ve to print something before processing the first line.

The following command will produce an error.$ cut -d “|” -f 1,4 emp.lst

Which one of the following commands is incorrect?

Which function is identical to Strstr ( )?

Process of breaking up a long string into words is called as

Case functions are used for

The printf function uses _ for string data and _ for numeric.