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






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






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






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






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






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






7. Removes the last element from the array pop






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






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






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






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






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






13. In arrays elements need not be __________






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. Assignment of a hash variable for a single hash element






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






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






18. Returns the length of the string including escape sequences






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






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






21. Removes trailing newline






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






23. 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






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






25. Delete the hash entry with the key given






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






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






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






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






30. Remove trailing newline from each element in the array






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


32. Reverses the elements of the array






33. < - > - == - <= - >= - !=






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






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






36. _________ in perl - An associative array






37. Removes the first element of the array shift






38. To write to a filehandle






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






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






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






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






43. 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






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






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






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






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






48. Sort and array alphabetically






49. 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






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