Test your basic knowledge |

Perl Programming

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Add a new element to the from of the array with the value $newwValue






2. Reverses the elements of the array






3. Adds a new element to end of the array with value $newValue






4. Delete the hash entry with the key given






5. A special system variable used to pass arguments to script






6. scalar(@arrayName) returns the ______ of the array names






7. Returns a copy of the string with the first letter lower case






8. Arrays can be assigned or read in _________






9. The variable that provides the last index of an array






10. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;






11. The use of ______ in perl - Documenting code - Created by placing a "#" on a line. - are not multi-line






12. The two primary methods of executing _______ in perl: - system("command args") - - `command args`






13. To read an entire file into an array (one line per element)






14. ________ in perl - can be scalar array or hash context - tells the interpreter what you are looking for (Ex: "$arrayname[$index_number]")






15. Join the elements of the array seperating the elements with the ':' character

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16. Explain how to read a line from a file handle






17. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string






18. Swap keys for values and values for keys. Will cause issues if there are multiple hash entries with the same value






19. The two phases of creating a PERL program _______ - Execution






20. Removes the last element from the array pop






21. Remove trailing newline from each element in the array






22. _________ @arrayName) returns the size of the array






23. Sort and array alphabetically






24. The __________ in perl: - uses grave marks `command args`- returns the output of the command to the variable you specify - if $output = `command arg` the output is stored all in one variable (all lines seperated by n) - if @output = `command arg` the






25. Returns a two element ray of the next key value pair; resultArray[0] is the key resultArray[1] is the value






26. Returns all of the values of the hash as an array






27. In perl the _______ will recognize syntax errors and halt execution BEFORE it begins - and will output statements; it does not understand and the line which it encountered the error on






28. _________ in perl - Singular variable - starts with "$" - Number or characer or string- Perl does automatic type conversion of these






29. Regular ____________: w - alphanumeric word including underscor - d - digits 0-9 - s any whitespace - . - any character






30. _________ $#arrayName give value of last index available in the array. Ex an array of size 5 will have its $#arrayName = 4






31. Returns a copy of the string with the first letter upper case






32. Common ________: pop(@array) - push(@array, $new Value) - shift(@array) - unshift(@array, $newValue) - sort(@array) - reverse(@array)






33. Assignment of a hash variable for a single hash element






34. Returns a copy of the string as all upper case






35. The four types of loops in perl: while - until - for - ________






36. The open() statement in perl: open(________, file_mode, "filename.txt")






37. < - > - == - <= - >= - !=






38. Returns all of the keys of the hash as an array






39. Returns the length of the string including escape sequences






40. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program






41. To include modules in perl






42. Stores information about the current users environment. You can print this from the command line using printenv






43. Common ___________: substr($string, $start, $numchars); - length($string) - lc($string) - uc($string) - chomp($string) - chomp(@string) - join(':", @string) - split(/\s/, $string) - lcfirst($string) - ucfirst($string)






44. Assignment of hash variables in perl (when oringally defining the hash)






45. The use of "if" "if-else" and "if-elsif-else"






46. $#arrayName returns the value of the ______ of the array (NOT the data stored in that array element)






47. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters






48. Two ____________ in regular expressions: =~ Contains - !~ Does not contain






49. Returns a copy of the string as all lower case






50. Removes trailing newline