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. Reverses the elements of the array






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






3. 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






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






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






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






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






8. Delete the hash entry with the key given






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






10. Returns the length of the string including escape sequences






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






12. To write to a filehandle






13. 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






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






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






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






17. To include modules in perl






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






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






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






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






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






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






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






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






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






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






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






29. In arrays elements need not be __________






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






31. Removes the first element of the array shift






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






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






34. Remove trailing newline from each element in the array






35. _________ in perl - An associative array






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






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






38. Sort and array alphabetically






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






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






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


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






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






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






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






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






47. Removes the last element from the array pop






48. Removes trailing newline






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






50. Arrays can be assigned or read in _________