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


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






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






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






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






6. Returns the length of the string including escape sequences






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






8. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)






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






10. 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






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






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






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






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






15. Delete the hash entry with the key given






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






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






18. < - > - == - <= - >= - !=






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






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






21. Arrays can be assigned or read in _________






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






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






24. 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






25. Sort and array alphabetically






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






27. Remove trailing newline from each element in the array






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






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






30. Does the hash key with "keyName" exists






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






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






33. Removes the first element of the array shift






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






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






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. The variable that provides the last index of an array






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






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






41. To write to a filehandle






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






43. Removes the last element from the array pop






44. To include modules in perl






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






46. Split string into an array using spaces as delimeter






47. In arrays elements need not be __________






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






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






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