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. Removes the first element of the array shift






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






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






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






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






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






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






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






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






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






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






13. Reverses the elements of the array






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






15. 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






16. Removes trailing newline






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






18. In arrays elements need not be __________






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






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






21. 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






22. Split string into an array using spaces as delimeter






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






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






25. Remove trailing newline from each element in the array






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






27. Does the hash key with "keyName" exists






28. Returns the length of the string including escape sequences






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






30. _________ in perl - An associative array






31. Arrays can be assigned or read in _________






32. Delete the hash entry with the key given






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






34. To write to a filehandle






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






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






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






38. Removes the last element from the array pop






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






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






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






42. < - > - == - <= - >= - !=






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






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






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






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






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






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






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