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






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






3. Does the hash key with "keyName" exists






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






5. Removes the first element of the array shift






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






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






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






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






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






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






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






13. Reverses the elements of the array






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






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






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






17. Remove trailing newline from each element in the array






18. To include modules in perl






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






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






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






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






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






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






25. Removes the last element from the array pop






26. 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






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






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






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






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






31. 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






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






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






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






35. Arrays can be assigned or read in _________






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. 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






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






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






42. To write to a filehandle






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






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






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






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






47. Split string into an array using spaces as delimeter






48. _________ in perl - An associative array






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






50. Sort and array alphabetically