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


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






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






4. Split string into an array using spaces as delimeter






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






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






7. Removes trailing newline






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






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






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






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






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






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






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






15. Removes the first element of the array shift






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






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






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






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






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






22. Delete the hash entry with the key given






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






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






25. 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






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






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






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






29. Removes the last element from the array pop






30. Arrays can be assigned or read in _________






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






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






33. To write to a filehandle






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






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






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






37. Sort and array alphabetically






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






39. Returns the length of the string including escape sequences






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






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






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






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






44. _________ in perl - An associative array






45. 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






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






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






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






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






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