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Question-1. What is Perl?
Answer-1: Perl is a high-level, interpreted programming language known for text processing and system administration.
Question-2. Who developed Perl?
Answer-2: Perl was developed by Larry Wall in 1987.
Question-3. What does "Perl" stand for?
Answer-3: "Practical Extraction and Report Language," though it is a backronym.
Question-4. What are Perl's main uses?
Answer-4: Perl is used for text processing, web development, system administration, and network programming.
Question-5. What is CPAN in Perl?
Answer-5: CPAN (Comprehensive Perl Archive Network) is a repository of Perl modules and software.
Question-6. How do you declare a scalar variable in Perl?
Answer-6: Use the $ symbol. Example: $variable = 10;.
Question-7. What is the difference between @ and % in Perl?
Answer-7: @ is used for arrays, while % is used for hashes.
Question-8. How do you create an array in Perl?
Answer-8: Use the @ symbol. Example: @array = (1, 2, 3);.
Question-9. How do you access an array element in Perl?
Answer-9: Use the $ symbol with the index. Example: $array[0].
Question-10. What is a hash in Perl?
Answer-10: A hash is a collection of key-value pairs, declared using %.
Question-11. How do you access a hash value in Perl?
Answer-11: Use the $ symbol with the key. Example: $hash{'key'}.
Question-12. What are Perl's data types?
Answer-12: Perl's main data types are scalars, arrays, and hashes.
Question-13. What is the print function in Perl?
Answer-13: print outputs text or variables to the screen. Example: print "Hello, World!\n";.
Question-14. How do you take input from the user in Perl?
Answer-14: Use the
Question-15. What is a Perl module?
Answer-15: A module is a package that can be reused in other Perl programs.
Question-16. How do you include a module in Perl?
Answer-16: Use the use keyword. Example: use strict;.
Question-17. What is the difference between use and require in Perl?
Answer-17: use is checked at compile time; require is checked at runtime.
Question-18. How do you declare a subroutine in Perl?
Answer-18: Use the sub keyword. Example: sub my_function { print "Hello!"; }.
Question-19. How do you call a subroutine in Perl?
Answer-19: Use the subroutine's name with parentheses. Example: my_function();.
Question-20. What is the purpose of the strict module in Perl?
Answer-20: strict enforces good programming practices, like declaring variables before use.
Question-21. What is the purpose of the warnings module in Perl?
Answer-21: warnings helps identify potential issues in the code by generating warnings.
Question-22. How do you open a file in Perl?
Answer-22: Use the open function. Example: open(my $fh, '<', 'file.txt');.
Question-23. How do you close a file in Perl?
Answer-23: Use the close function. Example: close($fh);.
Question-24. How do you read a file line by line in Perl?
Answer-24: Use a filehandle with a while loop. Example: while (<$fh>) { print $_; }.
Question-25. How do you write to a file in Perl?
Answer-25: Use the > mode with open. Example: open(my $fh, '>', 'file.txt');.
Question-26. What are Perl's comparison operators?
Answer-26: Numeric: ==, !=, <, >, <=, >=. String: eq, ne, lt, gt, le, ge.
Question-27. How do you use regular expressions in Perl?
Answer-27: Use the =~ operator with a pattern. Example: $text =~ /pattern/;.
Question-28. What is the purpose of $_ in Perl?
Answer-28: $_ is the default variable in Perl for the current input or string in loops and regex.
Question-29. What is the chomp function in Perl?
Answer-29: chomp removes the newline character from the end of a string.
Question-30. How do you concatenate strings in Perl?
Answer-30: Use the . operator. Example: $str = $str1 . $str2;.
Question-31. What is the split function in Perl?
Answer-31: split divides a string into a list based on a delimiter. Example: @words = split(' ', $text);.
Question-32. What is the join function in Perl?
Answer-32: join combines elements of a list into a string. Example: $str = join('-', @array);.
Question-33. What are Perl's loop structures?
Answer-33: Perl supports for, foreach, while, and until loops.
Question-34. How do you exit a loop in Perl?
Answer-34: Use the last statement to exit a loop.
Question-35. What is the next statement in Perl?
Answer-35: next skips the current iteration of a loop and proceeds to the next.
Question-36. How do you check the length of a string in Perl?
Answer-36: Use the length function. Example: length($string);.
Question-37. What is the substr function in Perl?
Answer-37: substr extracts a substring from a string. Example: substr($str, 0, 5);.
Question-38. How do you declare global variables in Perl?
Answer-38: Global variables are declared outside any block or function.
Question-39. How do you declare local variables in Perl?
Answer-39: Use the my keyword. Example: my $local_var = 10;.
Question-40. What is the difference between my and our in Perl?
Answer-40: my creates a private variable, while our creates a global variable in the current package.
Question-41. How do you handle exceptions in Perl?
Answer-41: Use eval blocks for exception handling. Example: eval { risky_code(); }; if ($@) { print "Error!"; }.
Question-42. How do you sort an array in Perl?
Answer-42: Use the sort function. Example: @sorted = sort @array;.
Question-43. What is the map function in Perl?
Answer-43: map applies a block of code to each element of a list and returns the transformed list.
Question-44. What is the grep function in Perl?
Answer-44: grep filters elements of a list based on a condition. Example: @evens = grep { $_ % 2 == 0 } @nums;.
Question-45. How do you create a package in Perl?
Answer-45: Use the package keyword. Example: package MyPackage;.
Question-46. What is the difference between die and warn in Perl?
Answer-46: die stops the program and displays an error; warn only displays a warning and continues execution.
Question-47. What is the undef function in Perl?
Answer-47: undef is used to remove a value from a variable or reset it to an undefined state.
Question-48. How do you pass arguments to a subroutine in Perl?
Answer-48: Arguments are passed as a list in @_. Example: sub my_sub { my ($arg1, $arg2) = @_; }.
Question-49. How do you check if a file exists in Perl?
Answer-49: Use the -e file test operator. Example: if (-e 'file.txt') { print "File exists"; }.
Question-50. How do you execute system commands in Perl?
Answer-50: Use the system() function. Example: system('ls -l');.
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