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. Does the hash key with "keyName" exists






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






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






4. Remove trailing newline from each element in the array






5. 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






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






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






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






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






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






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






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






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






14. Removes the first element of the array shift






15. Arrays can be assigned or read in _________






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






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






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






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






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






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






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






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






24. 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






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






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






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






28. In arrays elements need not be __________






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






30. Removes trailing newline






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






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






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






34. 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






35. Returns the length of the string including escape sequences






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






37. Delete the hash entry with the key given






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






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


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






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






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






43. Removes the last element from the array pop






44. _________ in perl - An associative array






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






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






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






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






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






50. Split string into an array using spaces as delimeter