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






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






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






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






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






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






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






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






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






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






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






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






13. Removes the first element of the array shift






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






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






16. Remove trailing newline from each element in the array






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






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






19. < - > - == - <= - >= - !=






20. Reverses the elements of the array






21. Returns the length of the string including escape sequences






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






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






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


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






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






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. Arrays can be assigned or read in _________






30. 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






31. 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






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






33. _________ in perl - An associative array






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






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






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






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






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






39. Delete the hash entry with the key given






40. Removes the last element from the array pop






41. In arrays elements need not be __________






42. Split string into an array using spaces as delimeter






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






44. To write to a filehandle






45. To include modules in perl






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






47. Sort and array alphabetically






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






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






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