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. Returns the length of the string including escape sequences






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






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






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






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






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






7. Sort and array alphabetically






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






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






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






11. Remove trailing newline from each element in the array






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






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






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






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






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






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






18. Removes trailing newline






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






20. Removes the last element from the array pop






21. To include modules in perl






22. To write to a filehandle






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






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






25. 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






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






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






28. Split string into an array using spaces as delimeter






29. Delete the hash entry with the key given






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






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






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






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






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






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






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






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






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






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






40. < - > - == - <= - >= - !=






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






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






43. Does the hash key with "keyName" exists






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






45. In arrays elements need not be __________






46. _________ in perl - An associative array






47. Removes the first element of the array shift






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






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






50. Arrays can be assigned or read in _________