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. Assignment of a hash variable for a single hash element






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






3. Returns the length of the string including escape sequences






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


5. Reverses the elements of the array






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






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






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






9. In arrays elements need not be __________






10. Does the hash key with "keyName" exists






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






12. Arrays can be assigned or read in _________






13. 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






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






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






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






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






18. _________ in perl - An associative array






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






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






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






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






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






24. Removes the first element of the array shift






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






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






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






28. Removes trailing newline






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






30. < - > - == - <= - >= - !=






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






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






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






34. Remove trailing newline from each element in the array






35. Sort and array alphabetically






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






37. Split string into an array using spaces as delimeter






38. To include modules in perl






39. 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






40. Removes the last element from the array pop






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






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






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






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






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






46. Delete the hash entry with the key given






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






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






49. 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






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