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






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






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






4. Removes the last element from the array pop






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






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






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






8. Returns the length of the string including escape sequences






9. Remove trailing newline from each element in the array






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






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






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






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






14. Split string into an array using spaces as delimeter






15. To include modules in perl






16. Removes the first element of the array shift






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






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






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






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






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






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






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






25. To write to a filehandle






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






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


28. Does the hash key with "keyName" exists






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






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






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






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






33. Delete the hash entry with the key given






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






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






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






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






38. Arrays can be assigned or read in _________






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. 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






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






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






43. _________ in perl - An associative array






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






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






46. Sort and array alphabetically






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






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






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






50. 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