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






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






3. To include modules in perl






4. Delete the hash entry with the key given






5. Sort and array alphabetically






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






7. _________ in perl - An associative array






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






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






10. 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






11. Does the hash key with "keyName" exists






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






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






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






15. Removes the last element from the array pop






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






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






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






19. To write to a filehandle






20. In arrays elements need not be __________






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






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






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






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






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






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






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






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






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






30. Arrays can be assigned or read in _________






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






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






33. Reverses the elements of the array






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






35. Removes trailing newline






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






37. 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






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






39. Removes the first element of the array shift






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






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






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






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






44. 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






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






46. Remove trailing newline from each element in the array






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






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






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






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