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






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






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






4. Returns the length of the string including escape sequences






5. 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






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






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






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






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






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






11. Split string into an array using spaces as delimeter






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






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






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






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






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






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






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






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






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






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






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






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






24. Sort and array alphabetically






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






26. Delete the hash entry with the key given






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






28. Removes the first element of the array shift






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






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






31. Reverses the elements of the array






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






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


34. Remove trailing newline from each element in the array






35. _________ in perl - An associative array






36. Removes trailing newline






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






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






39. To include modules in perl






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






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






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






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






44. Arrays can be assigned or read in _________






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






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






47. 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






48. 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






49. Removes the last element from the array pop






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