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






2. 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






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






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






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






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






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






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






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






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






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






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






13. Sort and array alphabetically






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






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






16. 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






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






18. Removes trailing newline






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






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






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






22. Split string into an array using spaces as delimeter






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






24. Returns the length of the string including escape sequences






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






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






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






28. Remove trailing newline from each element in the array






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






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






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






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






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






34. Does the hash key with "keyName" exists






35. _________ in perl - An associative array






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






37. To include modules in perl






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






39. In arrays elements need not be __________






40. Removes the last element from the array pop






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






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






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






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






45. Removes the first element of the array shift






46. < - > - == - <= - >= - !=






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






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






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






50. Arrays can be assigned or read in _________