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 copy of the string with the first letter upper case






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






3. In arrays elements need not be __________






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






5. Arrays can be assigned or read in _________






6. Returns the length of the string including escape sequences






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






8. Removes the last element from the array pop






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






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






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






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






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






14. Remove trailing newline from each element in the array






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






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






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






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






19. 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






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






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






22. Delete the hash entry with the key given






23. Does the hash key with "keyName" exists






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






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






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






28. < - > - == - <= - >= - !=






29. Removes the first element of the array shift






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






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






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






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


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






35. 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






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






37. Split string into an array using spaces as delimeter






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






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






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






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






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






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






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






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






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






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






48. _________ in perl - An associative array






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






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