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 hash variables in perl (when oringally defining the hash)






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






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






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






5. Sort and array alphabetically






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






7. Arrays can be assigned or read in _________






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






9. Split string into an array using spaces as delimeter






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






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






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






13. Remove trailing newline from each element in the array






14. Removes the last element from the array pop






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






16. 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






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






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






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






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






21. Removes the first element of the array shift






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






23. Returns the length of the string including escape sequences






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






25. To include modules in perl






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






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


28. Delete the hash entry with the key given






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






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






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






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






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






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






35. < - > - == - <= - >= - !=






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. Removes trailing newline






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






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






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






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






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






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






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






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






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






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






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






49. _________ in perl - An associative array






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