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. Removes the first element of the array shift






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






3. To write to a filehandle






4. Reverses the elements of the array






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






6. 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






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






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






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






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






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






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






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






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






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






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






17. Sort and array alphabetically






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






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






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






21. 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






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






23. Removes trailing newline






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






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






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






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






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






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






30. 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






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






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






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






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






35. Does the hash key with "keyName" exists






36. Delete the hash entry with the key given






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






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






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






40. Returns the length of the string including escape sequences






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






42. Removes the last element from the array pop






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






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






45. Remove trailing newline from each element in the array






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






47. To include modules in perl






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






49. _________ in perl - An associative array






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