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






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






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






4. Does the hash key with "keyName" exists






5. Split string into an array using spaces as delimeter






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






7. 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






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






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






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






11. Removes the last element from the array pop






12. Removes the first element of the array shift






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






14. 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






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






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






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






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






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






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






21. Reverses the elements of the array






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






23. 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






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






25. _________ in perl - An associative array






26. Delete the hash entry with the key given






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






28. < - > - == - <= - >= - !=






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






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






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






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






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






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






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






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






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






38. Remove trailing newline from each element in the array






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






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






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






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






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






44. In arrays elements need not be __________






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






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


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






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






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






50. Sort and array alphabetically