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. _________ @arrayName) returns the size of the array






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






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






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






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






6. Sort and array alphabetically






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






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






9. Does the hash key with "keyName" exists






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






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






12. Returns the length of the string including escape sequences






13. 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






14. To include modules in perl






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






16. Remove trailing newline from each element in the array






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






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






19. Reverses the elements of the array






20. To write to a filehandle






21. Removes trailing newline






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






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






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






25. Removes the first element of the array shift






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






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


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






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






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






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






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






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






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






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






36. Removes the last element from the array pop






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






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






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






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






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






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. 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






45. Split string into an array using spaces as delimeter






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






47. < - > - == - <= - >= - !=






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






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






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