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 a copy of the string as all upper case






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






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


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






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






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






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






8. Returns the length of the string including escape sequences






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






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






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






12. Reverses the elements of the array






13. < - > - == - <= - >= - !=






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






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






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






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






18. Remove trailing newline from each element in the array






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






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






21. To include modules in perl






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






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






24. 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






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






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






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






28. Removes the last element from the array pop






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






30. Removes trailing newline






31. Removes the first element of the array shift






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






33. 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






34. To write to a filehandle






35. Delete the hash entry with the key given






36. 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






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






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






39. In arrays elements need not be __________






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






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






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






43. Sort and array alphabetically






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






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






46. Arrays can be assigned or read in _________






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






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






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






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