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. Removes the first element of the array shift






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






18. Reverses the elements of the array






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






20. In arrays elements need not be __________






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






22. Removes trailing newline






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






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






25. The three basic ________ of the open() function: > write - >> append - < read file






26. Split string into an array using spaces as delimeter






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






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






29. To include modules in perl






30. Arrays can be assigned or read in _________






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






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






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






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






35. Does the hash key with "keyName" exists






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


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






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






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






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






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






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






43. Sort and array alphabetically






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






45. 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






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






47. Delete the hash entry with the key given






48. 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






49. Returns the length of the string including escape sequences






50. _________ in perl - An associative array