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






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






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






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






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






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






7. 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






8. 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






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






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






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






12. Remove trailing newline from each element in the array






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






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






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






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






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






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






19. < - > - == - <= - >= - !=






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






21. To include modules in perl






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






23. Removes trailing newline






24. Does the hash key with "keyName" exists






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






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






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






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






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






30. Sort and array alphabetically






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






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






33. Removes the first element of the array shift






34. To write to a filehandle






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






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


37. In arrays elements need not be __________






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






39. Removes the last element from the array pop






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






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






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






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






44. Split string into an array using spaces as delimeter






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






46. 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






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






48. Reverses the elements of the array






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






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