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






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






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






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






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






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






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






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






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






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






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






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






13. Removes the first element of the array shift






14. To write to a filehandle






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






16. Reverses the elements of the array






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






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






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






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






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






22. Returns the length of the string including escape sequences






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






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






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






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






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






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






30. Does the hash key with "keyName" exists






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






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






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






34. Remove trailing newline from each element in the array






35. Removes the last element from the array pop






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






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






38. 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






39. _________ in perl - An associative array






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






41. Arrays can be assigned or read in _________






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


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






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






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






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






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






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






49. Sort and array alphabetically






50. 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