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






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






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






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






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






6. Removes the first element of the array shift






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. Returns the length of the string including escape sequences






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






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






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






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






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






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






15. In arrays elements need not be __________






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






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






18. Sort and array alphabetically






19. Remove trailing newline from each element in the array






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






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






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






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






24. Reverses the elements of the array






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






26. _________ in perl - An associative array






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






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






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


30. Removes the last element from the array pop






31. 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






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






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






34. Arrays can be assigned or read in _________






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






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






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






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






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






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






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






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






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






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






45. To include modules in perl






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






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






48. < - > - == - <= - >= - !=






49. To write to a filehandle






50. Removes trailing newline