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






2. Delete the hash entry with the key given






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






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






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






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






7. To write to a filehandle






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






9. _________ in perl - An associative array






10. Split string into an array using spaces as delimeter






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






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






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






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






15. 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






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






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






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






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






20. < - > - == - <= - >= - !=






21. Does the hash key with "keyName" exists






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






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






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






25. In arrays elements need not be __________






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






27. Remove trailing newline from each element in the array






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






29. Arrays can be assigned or read in _________






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






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






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


33. Reverses the elements of the array






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






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






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






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






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






39. Removes the last element from the array pop






40. Removes trailing newline






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






42. 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






43. Sort and array alphabetically






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






45. 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






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






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






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






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






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