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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






16. Reverses the elements of the array






17. Removes trailing newline






18. Sort and array alphabetically






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






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






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






22. Does the hash key with "keyName" exists






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






24. _________ in perl - An associative array






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






26. 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






27. To include modules in perl






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






29. In arrays elements need not be __________






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






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






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






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






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


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






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






37. Removes the first element of the array shift






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






39. Removes the last element from the array pop






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






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






42. Delete the hash entry with the key given






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






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






45. < - > - == - <= - >= - !=






46. Arrays can be assigned or read in _________






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






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






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






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