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






2. 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






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






4. < - > - == - <= - >= - !=






5. eq - ne - lt - le - gt - ge






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






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






8. Add a new element to the from of the array with the value $newwValue






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






10. Sort and array alphabetically






11. ________ in perl - A collection of data (static data or scalar variables or arrays or hashes can all be stored in an array element)






12. To write to a filehandle






13. Removes trailing newline






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






15. Returns the length of the string including escape sequences






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






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






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






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






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






21. Reverses the elements of the array






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






23. _________ in perl - An associative array






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






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






26. Removes the first element of the array shift






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






28. Does the hash key with "keyName" exists






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






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






31. Arrays can be assigned or read in _________






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






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






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






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






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






37. The _______ in perl: - used to execute an external command - will output results of command to terminal - returns the exit status of the program that ran - use this for commands that you dont care about SAVING the output to a variable






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






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






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


41. Remove trailing newline from each element in the array






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






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






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






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






46. The purpose of {} in an "if" statement: To Define the __________ of the if statement. Unlike C the {} braces ARE REQUIRED






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






48. To get rid of the ________ in $line you could now chomp() (Ex: chomp($line);)






49. Split string into an array using spaces as delimeter






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