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






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






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






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






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






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


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






8. Split string into an array using spaces as delimeter






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






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






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






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






13. Removes trailing newline






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






15. Removes the last element from the array pop






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






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






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






19. In arrays elements need not be __________






20. Sort and array alphabetically






21. Arrays can be assigned or read in _________






22. Delete the hash entry with the key given






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






24. Reverses the elements of the array






25. Returns the length of the string including escape sequences






26. 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






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






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






29. Remove trailing newline from each element in the array






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






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






32. 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






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






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






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






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






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






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






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






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






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






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






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






44. < - > - == - <= - >= - !=






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






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






47. To write to a filehandle






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






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






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