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






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






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






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






5. To write to a filehandle






6. Removes trailing newline






7. Remove trailing newline from each element in the array






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






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






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






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






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






13. _________ in perl - An associative array






14. Removes the first element of the array shift






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


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






17. Returns the length of the string including escape sequences






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






19. Does the hash key with "keyName" exists






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






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






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






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






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






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






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






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






28. Arrays can be assigned or read in _________






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






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






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






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






33. Reverses the elements of the array






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






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






36. In arrays elements need not be __________






37. To include modules in perl






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






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






40. Delete the hash entry with the key given






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






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






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






44. 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






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






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






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






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






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