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. Removes the last element from the array pop






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






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






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






6. Remove trailing newline from each element in the array






7. _________ in perl - An associative array






8. 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






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






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






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






12. To write to a filehandle






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






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






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






16. 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






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






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






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






20. Split string into an array using spaces as delimeter






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






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






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






24. Removes the first element of the array shift






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






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






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






28. Removes trailing newline






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






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






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






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






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






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






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






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






37. To include modules in perl






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






39. Arrays can be assigned or read in _________






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






41. < - > - == - <= - >= - !=






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






43. Sort and array alphabetically






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






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






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






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






48. 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






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






50. Reverses the elements of the array