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






2. < - > - == - <= - >= - !=






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






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






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






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






7. Arrays can be assigned or read in _________






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


10. Removes the first element of the array shift






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






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






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






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






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






16. Returns the length of the string including escape sequences






17. To write to a filehandle






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






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






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






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






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






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






24. 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






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






26. Sort and array alphabetically






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






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






29. _________ in perl - An associative array






30. Delete the hash entry with the key given






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






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






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






34. Split string into an array using spaces as delimeter






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






36. To include modules in perl






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






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






39. 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






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






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. Remove trailing newline from each element in the array






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






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






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






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






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






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






49. Removes trailing newline






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