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

Cgi Perl

Ques:- What are the advantages of c over Perl?

Asked In :-

Right Answer:
1. Performance: C is generally faster and more efficient than Perl due to its compiled nature.
2. Control: C provides low-level memory management and system-level access, allowing for more precise control over hardware.
3. Portability: C code can be compiled on various platforms with minimal changes, while Perl may depend on specific libraries or modules.
4. Static Typing: C uses static typing, which can help catch errors at compile time, whereas Perl uses dynamic typing.
5. Resource Usage: C typically has lower memory overhead compared to Perl, making it suitable for resource-constrained environments.

Cgi Perl

Ques:- Mention how many ways you can express string in Perl?

Asked In :-

Right Answer:
In Perl, you can express a string in several ways, including:

1. Double quotes (`"string"`)
2. Single quotes (`'string'`)
3. Here-documents (`<<EOF ... EOF`)
4. Backticks (`` `command` `` for command output)
5. q// operator (for single-quoted strings)
6. qq// operator (for double-quoted strings)
7. qx// operator (for command output, similar to backticks)

So, there are at least seven ways to express strings in Perl.

Cgi Perl

Ques:- what is Perl one liner?

Asked In :-

Right Answer:
A Perl one-liner is a short Perl script that is executed in a single line from the command line, often used for quick text processing or data manipulation tasks.

Cgi Perl

Ques:- Which has the highest precedence, List or Terms? Explain?

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Right Answer:
In Perl, List has the highest precedence over Terms. This means that when evaluating expressions, lists are processed before terms.

Cgi Perl

Ques:- what is the function that is used to identify how many characters are there in a string?

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Right Answer:
The function used to identify how many characters are in a string in Perl is `length()`.

Cgi Perl

Ques:- List the prefix dereferencer in Perl.

Asked In :-

Right Answer:
The prefix dereferencers in Perl are:

1. `$$` - Dereference a scalar reference
2. `@{}` - Dereference an array reference
3. `%{}` - Dereference a hash reference
4. `&{}` - Dereference a code reference
5. `*{}` - Dereference a typeglob reference

Cgi Perl

Ques:- Which guidelines by Perl modules must be followed?

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Right Answer:
Perl modules should follow these guidelines:

1. Use strict and warnings pragmas.
2. Use meaningful names for modules and functions.
3. Document the module with POD (Plain Old Documentation).
4. Follow the naming conventions (e.g., use CamelCase for module names).
5. Keep the module's interface simple and intuitive.
6. Ensure compatibility with different versions of Perl.
7. Write tests to verify functionality.
8. Use version control for the module's source code.

Cgi Perl

Ques:- Where is chomp used, and what does it mean?

Asked In :-

Right Answer:

Chomp is used in Perl to remove the trailing newline character from a string. It modifies the string in place, ensuring that the string does not end with a newline.

Cgi Perl

Ques:- How can you replace the characters from a string and save the number of replacements?

Asked In :-

Right Answer:
You can use the `s///` operator in Perl to replace characters in a string and save the number of replacements by using the special variable `$&` to count them. Here's an example:

```perl
my $string = "hello world";
my $count = ($string =~ s/o/X/g); # Replace 'o' with 'X'
print "Modified string: $stringn";
print "Number of replacements: $countn";
```

Cgi Perl

Ques:- Does Perl have objects? If yes, then does it force you to use objects? If no, then why?

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Right Answer:
Yes, Perl has objects, but it does not force you to use them. You can choose to use procedural programming if you prefer.

Cgi Perl

Ques:- Difference between the variables in which chomp function work ?

Asked In :-

Right Answer:
The `chomp` function in Perl works on scalars (single values) and arrays (lists of values). It removes the newline character from the end of a string in a scalar variable or from each element in an array. However, it does not affect hash keys or values directly.

Cgi Perl

Ques:- Write a program to concatenate the $firststring and $secondstring and result of these strings should be separated by a single space.

Asked In :-

Right Answer:
```perl
#!/usr/bin/perl
use strict;
use warnings;

my $firststring = "Hello";
my $secondstring = "World";
my $result = "$firststring $secondstring";

print "$resultn";
```

Comments

Tooba Ali Nov 6, 2022

#!/usr/bin/perl
$a= 20;
$b=5;
if ($a>$b) {
$add= $a+$b;
printf "Operation Successfull! \n";
}
else{
printf "Operation not Successfull! \n";
}

Cgi Perl

Ques:- What is the usage of -i and 0s options?

Asked In :-

Right Answer:
The `-i` option in Perl is used for in-place editing of files, allowing you to modify a file directly. The `0s` option is used to enable slurp mode, which reads the entire file content into a single string, treating the input as a single line by removing newline characters.

Cgi Perl

Ques:- What is the use of -w, -t and strict in Perl?

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Right Answer:
In Perl, `-w` enables warnings, helping to identify potential issues in the code. `-t` enables taint mode, which helps to prevent security vulnerabilities by ensuring that data from untrusted sources is properly validated before use. `use strict;` enforces strict variable declaration rules, preventing the use of undeclared variables and helping to catch errors early.

Cgi Perl

Ques:- Why Perl aliases are considered to be faster than references?

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Right Answer:
Perl aliases are considered faster than references because they directly point to the original variable, allowing for immediate access and modification without the overhead of dereferencing, which is required for references.

Cgi Perl

Ques:- Which feature of Perl provides code reusability ? Give any example of that feature.

Asked In :-

Right Answer:
The feature of Perl that provides code reusability is "subroutines." For example:

```perl
sub greet {
my $name = shift;
return "Hello, $name!";
}

print greet("Alice"); # Outputs: Hello, Alice!
```

Comments

Admin May 17, 2020

inheritance feature of Perl provides code re usability. In inheritance, the child class can use the methods and property of parent class

Cgi Perl

Ques:- For a situation in programming, how can you determine that Perl is a suitable?

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Right Answer:
Perl is suitable for programming situations that involve text processing, data manipulation, quick prototyping, and working with web applications, especially when handling CGI scripts or regular expressions.

Cgi Perl

Ques:- Explain what is STDIN, STDOUT and STDERR?

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Right Answer:
STDIN, STDOUT, and STDERR are standard streams in Perl (and many programming languages):

- **STDIN**: Standard Input, used for reading input from the user or another program.
- **STDOUT**: Standard Output, used for sending output to the console or another program.
- **STDERR**: Standard Error, used for sending error messages or diagnostics to the console or another program.

Cgi Perl

Ques:- What does -> symbol indicates in Perl?

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:- How can you use Perl warnings and what is the importance to use them?

Asked In :-

Right Answer:
You can use Perl warnings by including the `use warnings;` pragma at the beginning of your script. This enables warnings for problematic constructs, helping you identify potential issues in your code. Using warnings is important because it aids in debugging, improves code quality, and helps prevent runtime errors by alerting you to questionable practices.

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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