Cgi Perl Interview Questions and Answers in 2025 (100+ Q&A)

Cgi Perl

Ques:- How can you call a subroutine and identify a subroutine?

Asked In :-

Right Answer:
In Perl, you can call a subroutine by using its name followed by parentheses. To identify a subroutine, you define it using the `sub` keyword followed by the subroutine name. For example:

```perl
sub my_subroutine {
# code here
}

my_subroutine(); # Calling the subroutine
```

Cgi Perl

Ques:- In Perl, what is grep function used for?

Asked In :-

Right Answer:
The `grep` function in Perl is used to filter a list by evaluating a block or expression for each element and returning only those elements for which the expression is true.

Cgi Perl

Ques:- In Perl, there are some arguments that are used frequently. What are that arguments and what do they mean?

Asked In :-

Right Answer:
In Perl, commonly used arguments include:

1. `@ARGV` - An array that contains the command-line arguments passed to the script.
2. `$0` - The name of the script being executed.
3. `$#ARGV` - The index of the last element in the `@ARGV` array, indicating the number of arguments minus one.
4. `$!` - The error message associated with the last system or library call that failed.
5. `$?` - The exit status of the last executed command.

These arguments help in handling input and managing script execution.

Cgi Perl

Ques:- what are the two ways to get private values inside a subroutine or block?

Asked In :-

Right Answer:
You can get private values inside a subroutine or block in Perl using:

1. Lexical variables (declared with `my`).
2. Package variables (using `our` or by accessing global variables with the package name).

Cgi Perl

Ques:- Write syntax to use grep function?

Asked In :-

Right Answer:
The syntax to use the `grep` function in Perl is:

```perl
@filtered = grep { condition } @array;
```

Cgi Perl

Ques:- Write syntax to add two arrays together in perl?

Asked In :-

Right Answer:
```perl
@array3 = (@array1, @array2);
```

Cgi Perl

Ques:- What does the $_ symbol mean?

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Right Answer:

The `$_` symbol in Perl is the default variable that holds the current value in the context of many functions and loops.

Cgi Perl

Ques:- what is the function of Return Value?

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Right Answer:
In CGI Perl, the return value of a function indicates the result of that function's execution, which can be used for further processing or decision-making in the script.

Cgi Perl

Ques:- what is CPAN?

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Right Answer:
CPAN stands for Comprehensive Perl Archive Network, which is a large repository of Perl software and modules that can be easily downloaded and installed.

Cgi Perl

Ques:- Which statement has an initialization, condition check and increment expressions in its body? Write a syntax to use that statement.

Asked In :-

Right Answer:
The statement that has an initialization, condition check, and increment expressions in its body is the `for` loop.

Syntax:
```perl
for (my $i = 0; $i < 10; $i++) {
# code to be executed
}
```

Cgi Perl

Ques:- In CPAN module, name an instance you use.

Asked In :-

Right Answer:
One instance of a CPAN module I use is `LWP::UserAgent`.

Cgi Perl

Ques:- Which functions in Perl allows you to include a module file or a module and what is the difference between them?

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Right Answer:
In Perl, the functions `use` and `require` are used to include a module file. The difference is that `use` is evaluated at compile time and imports symbols, while `require` is evaluated at runtime and does not import symbols automatically.

Cgi Perl

Ques:- How can information be put into hashes?

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Right Answer:
Information can be put into hashes in Perl using the syntax: `$hash{key} = value;`. For example, to add a key-value pair, you would write `$hash{'name'} = 'John';`.

Cgi Perl

Ques:- Perl regular expressions match the longest string possible.” What is the name of this match?

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Right Answer:

Greedy match.

Cgi Perl

Ques:- How can memory be managed in Perl?

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Right Answer:
Memory in Perl is managed automatically through a process called garbage collection. Perl keeps track of the references to variables and automatically frees memory when there are no more references to an object or variable. Additionally, developers can use the `undef` function to explicitly free memory for scalars, arrays, or hashes when they are no longer needed.

Cgi Perl

Ques:- How the interpreter is used in Perl?

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Right Answer:
The Perl interpreter is used to execute Perl scripts by reading the code line by line, compiling it into an intermediate form, and then executing that code. You can run a Perl script by invoking the interpreter from the command line with the command `perl scriptname.pl`.

Cgi Perl

Ques:- What is the use of the -> symbol?

Asked In :-

Right Answer:

In Perl, the `->` symbol is used to dereference a reference, access methods, or access elements of a hash or array reference.

Cgi Perl

Ques:- What is the difference between die and exit in perl?

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Right Answer:
In Perl, `die` is used to terminate the program and print an error message, while `exit` is used to terminate the program with a specific exit status code without printing an error message.

Cgi Perl

Ques:- What is the easiest way to download the contents of a URL with Perl?

Asked In :-

Right Answer:
The easiest way to download the contents of a URL with Perl is to use the LWP::Simple module. You can do this with the following code:

```perl
use LWP::Simple;
my $url = 'http://example.com';
my $content = get($url);
```

This will store the contents of the URL in the `$content` variable.

Cgi Perl

Ques:- What does length(%HASH) produce if you have thirty-seven random keys in a newly created hash?

Asked In :-

Right Answer:
The result of `length(%HASH)` will be `0`.

The CGI Perl category on takluu.com is tailored for those who want to master web scripting and server-side programming using Perl in the context of CGI (Common Gateway Interface). Whether you’re applying for roles in legacy systems, automation testing, or back-end services, this section provides deep insights into Perl’s role in building dynamic web content.

Here, you’ll find the most commonly asked interview questions that test your understanding of CGI architecture, Perl syntax, form handling, server environment variables, file operations, and security practices in web applications.

Frequently covered questions include:

“What is CGI and how does it work with Perl?”
“How do you read form input using CGI Perl?”
“What are the advantages of using CGI with Perl?”
“How can you handle file uploads securely in CGI scripts?”
“Explain the difference between GET and POST methods in CGI.”

We break down complex scripting techniques into simple explanations and provide sample code snippets that mirror real-world scenarios. Whether you’re a beginner trying to understand the fundamentals or an experienced developer brushing up for an interview, this category offers immense value.

Our content is updated regularly based on recent interview patterns from tech companies that still rely on CGI-based systems or maintain older infrastructures.

Let Takluu be your preparation partner for CGI Perl roles and give you the confidence to crack even the toughest questions.

Questions in: Cgi Perl

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