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PERL Interview Questions

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PERL (Practical Extraction & Report Language) Interview Questions What arguments do you frequently use for the Perl interpreter and what do they mean? What does the command use strict do and why should you use it? What do the symbols $ @ and % mean when prefixing a variable? What elements of the Perl language could you use to structure your code to allow for maximum re-use and maximum readability? What are the characteristics of a project that is well suited to Perl? Why do you program in Perl? Explain the difference between my and local. What is difference between "Use" and "Require". In which case should "Use" be used and not "Require"? What s your favorite module and why? What is a hash? Write a simple (common) regular expression to match an IP address, e-mail address, city-state-zipcode combination. What purpose does each of the following serve: -w, strict, -T ? What is the difference between for & foreach, exec & system? Where do you go for Perl help? Name an instance where you used a CPAN module. How do you open a file for writing? How would you replace a char in string and how do you store the number of replacements? When would you not use Perl for a project? What is a subroutine? Perl uses single or double quotes to surround a zero or more characters. Are the single(' ') or double quotes (" ") identical? What are the benefits of having global and local variables? What does Perl do if you try to exploit the execve(2) race involving setuid scripts? When would `local $_' in a function ruin your day? What are the three ways to empty an array? Which of these is a difference between C++ and Perl? Name an instance you used in CPAN module? How do I read command-line arguments with Perl? What exactly is grooving and shortening of the array? Where do you go for Perl help? Why does Perl not have overloaded functions? How do you match one letter in the current locale? What does 'qw(..)' mean? What's the use of it? When do we use it? Name all the prefix dereferencer in Perl? Given a file, count the word occurrence (case insensitive) How many ways can we express string in Perl? Advantages of C over Perl? How do I set environment variables in Perl programs? What's the significance of @ISA, @EXPORT @EXPORT_OK %EXPORT_TAGS list & hashes in a perl package? With example? How to concatenate strings with Perl? How do you give functions private variables that retain their values between calls? What is meant by splicing arrays? Explain in context of list and scalar. What are the two different types of data perl handles? What happens to objects lost in "unreachable" memory? What does this symbol mean '->'? Why does Perl not have overloaded functions? Explain about Typeglobs? What is a short circuit operator? What are the different types of eval statements? What is a DataHash()? What does it mean and for what purpose it is used? I have a variable named $objref which is defined in main package. I want to make it as a Object of Class XYZ. How could I do it? What is your experience of interfacing Perl to database? Why is it hard to call this function: sub y? Which has the highest precedence, List or Terms? Explain? What is meant 'die' in a perl program? How to Connect with SqlServer from perl and how to display database table info? What are the different types of perl operators? How do you connect to database in perl? Explain "Perl regular expressions are greedy". Is there any way to add two arrays together? What is meant by a 'pack' in perl? What is the easiest way to download the contents of a URL with Perl? Why are not Perls patterns regular expressions? How do I print the entire contents of an array with Perl? How do I do fill_in_the_blank for each file in a directory? What value is returned by a lone return; statement? What is CPAN ? What are the modules coming under this? What does new $cur->{LINK} do? What are scalar data and scalar variables? What's the purpose of -w.strict,-T? What are the different forms of goto in perl? Explain? What does the word '&myvariable' mean? What does the symbol '&' means? What's purpose of it? How to turn on Perl warnings? Why is that important? What happens when you return a reference to a private variable? How to open and read data files with Perl What does this mean '$^0'? Write a script to reverse a string without using Perl's built in functions? Explain about an ivalue? What is Perl one-liner?

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