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






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






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






4. 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






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






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






7. 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






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






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






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






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






12. 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






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






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






15. To write to a filehandle






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






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






18. Sort and array alphabetically






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






20. Removes the last element from the array pop






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






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






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






24. < - > - == - <= - >= - !=






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






26. Remove trailing newline from each element in the array






27. To include modules in perl






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






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






30. Delete the hash entry with the key given






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






32. Removes the first element of the array shift






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






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


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






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






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






38. Arrays can be assigned or read in _________






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






40. Removes trailing newline






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






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






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






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






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






46. Reverses the elements of the array






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






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






49. Split string into an array using spaces as delimeter






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