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. Delete the hash entry with the key given






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






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






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






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






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






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






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






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






10. Returns the length of the string including escape sequences






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






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






13. _________ in perl - An associative array






14. < - > - == - <= - >= - !=






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

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16. Remove trailing newline from each element in the array






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






18. Removes the last element from the array pop






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






20. 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






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






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






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






24. Reverses the elements of the array






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






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






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






28. 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






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






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






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






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






33. In arrays elements need not be __________






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






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






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






37. 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






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






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






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






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






42. Removes the first element of the array shift






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






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






45. Sort and array alphabetically






46. Removes trailing newline






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






48. Does the hash key with "keyName" exists






49. The two phases of creating a PERL program _______ - Execution






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