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






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






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






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






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






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






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






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






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






10. Does the hash key with "keyName" exists






11. To write to a filehandle






12. 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






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






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






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






16. < - > - == - <= - >= - !=






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






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






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






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






21. Removes trailing newline






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






23. To include modules in perl






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






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






26. Arrays can be assigned or read in _________






27. In arrays elements need not be __________






28. Split string into an array using spaces as delimeter






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






30. Removes the first element of the array shift






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






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






33. Returns the length of the string including escape sequences






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






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






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






37. 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






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






39. Reverses the elements of the array






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






41. 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






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






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






44. Remove trailing newline from each element in the array






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






46. _________ in perl - An associative array






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






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






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






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