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. Reverses the elements of the array






3. 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






4. 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






5. Removes trailing newline






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






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






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






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






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






11. To include modules in perl






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






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






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






15. In arrays elements need not be __________






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






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






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






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






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






21. Removes the last element from the array pop






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






23. Split string into an array using spaces as delimeter






24. Removes the first element of the array shift






25. Arrays can be assigned or read in _________






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






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






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






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






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






31. To write to a filehandle






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






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






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






35. Does the hash key with "keyName" exists






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






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






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






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






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






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






42. < - > - == - <= - >= - !=






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






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






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






46. Sort and array alphabetically






47. Remove trailing newline from each element in the array






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






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






50. 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