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25 Best Perl Programming Interview Questions and Answers

What Is Perl Programming?
Perl is a free, open source, high-level, general-purpose, interpreted, and dynamic and cross platform programming language.

Perl was created by Larry Wall in 1987 and licensed under its Artistic License, or the GNU General Public License (GPL).
Larry Wall began work on Perl in 1987, while working as a programmer at Unisys.

When do you Use Perl Programming?
Perl is free, open source, portable, flexible and easy to learn. Perl supports both procedural and object-oriented programming and free.

It is easily to understandable due to its simple syntax. It’s also supports Unicode. Perl also works with popular mark-up languages like HTML, XML, and others.

What Are the Advantages of Perl Programming?
The Advantages of Perl Programming -
ü  Perl is a free open source language.
ü  Perl supports OOP (Object oriented programming) and Unicode.
ü  Perl is easily readable
ü  Perl is Y2K compliant
ü  Perl is easier to understand due to its simple syntax
ü  Perl is easier to use due to its flexibility
ü  Perl supports Unicode
ü  Perl supports both procedural and object-oriented programming

Is Perl a Case Sensitive Language?
Yes! Perl is a case sensitive programming language.

What is a Perl References?
A Perl reference is a scalar data type that holds the location of another value which could be scalar, arrays or hashes.

What does the “$_” symbol mean?
The “$_” is a default variable in Perl Programming and “$_” is known as the “default input and pattern matching space.

What Is CPAN?
CPAN stands for “Comprehensive Perl Archive Network” and CPAN is a large collection of Perl software and documentation.

How many Types of variable in Perl?
Perl has three built in type’s variable and it is -
1.      Scalar
2.      Array
3.      Hash

How To Renaming a file in Perl Programming?
rename ("/usr/files/file_1.txt", "/usr/files/file_2.txt" );

How To Deleting an existing file in Perl Programming?
unlink ("/usr/files/file_1.txt");

What Is the different between Array and Hash in Perl Programming?
ü  Hash - It is an unordered list of values position by keys.
ü  Array - It is an order list of values position by index.

What Is the difference between Use and Require in Perl Programming?
ü  Use – It’s used only for the modules and it included verified objects at the time of compilation. Also not require to give file extension
ü  Require – It’s used for both libraries and modules and it included verified objects at the time of run-time. It requires giving file extension.

What Are the different types of Perl Operators?
ü  Increment operators: ++
ü  Decrement operators: --
ü  String concatenation: ‘.’ operator
ü  Comparison operators: ==, !=, >, < , >= etc
ü  Logical operators: &&, ||, !
ü  Arithmetic operators, +, - ,* etc
ü  Assignment operators: += , -+, *= etc

How do you find the length of an Array?                

What Are the Arguments and What do they mean in Perl Programming?
ü  c - Which compile only not Run
ü  d - Use for debug
ü  e - Which Executes
ü  w - Argument shows warning

Which Guidelines by Perl modules must be followed?
The package name should begin with a capital letter.
The file name should have extension “.pm”.

Which Feature of PERL provides code reusability?
In the Perl, Inheritance used for provides code reusability. Perl fully supports to OOPs.

What Syntax Is used for grep() function?
The grep function is -
ü  grep BlOCK LIST
ü  grep ( EXPR, LIST )

What Is the purpose of “_FILE_ literal” and “_LINE_ literal” in Perl?
The “_FILE_ literal” is used to get the current file name and “_LINE_ literal” is used to get the current line number.

How will you access an element of a Perl Array?
To refer to a single element of an array and we will use ($) dollar sign with the variable name and its followed by the index of the element in square brackets. It looks like-


@ages = (33, 30, 44);            
@names = ("Anil", "Kumar", "Singh");

print "\$ages[0] = $ages[0]\n";
print "\$ages[1] = $ages[1]\n";
print "\$ages[2] = $ages[2]\n";
print "\$names[0] = $names[0]\n";
print "\$names[1] = $names[1]\n";
print "\$names[2] = $names[2]\n";

What Are the purpose of close(), getc() and read() functions?
The close() functions is used for disassociate the filehandle from the corresponding file.
The getc() function is used for returns a single character from the specified FILEHANDLE, or STDIN if none is specified.
The read() function is used to read binary data from the file.

What Is the difference between localtime() and gmtime() functions?
The localtime () function will return the current local time on the machine that runs the script.
The gmtime () function will return the universal Greenwich Mean Time (or GMT/UTC).

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