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. _________ in perl - An associative array






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






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






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






5. To include modules in perl






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






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






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






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






10. To write to a filehandle






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






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






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






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






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






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. Removes the last element from the array pop






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






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






20. In arrays elements need not be __________






21. Sort and array alphabetically






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






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






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






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






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






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






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






29. Returns the length of the string including escape sequences






30. Arrays can be assigned or read in _________






31. Reverses the elements of the array






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






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






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






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






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






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






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






39. Does the hash key with "keyName" exists






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






41. Removes trailing newline






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






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






44. 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






45. Removes the first element of the array shift






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






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


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






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