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. Arrays can be assigned or read in _________






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






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






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






5. Removes the last element from the array pop






6. In arrays elements need not be __________






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






8. < - > - == - <= - >= - !=






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






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






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. Explain how to read a line from a file handle






13. Split string into an array using spaces as delimeter






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






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






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






17. 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






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






19. _________ in perl - An associative array






20. To include modules in perl






21. Removes trailing newline






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






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






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

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






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






28. Delete the hash entry with the key given






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






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






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






32. To write to a filehandle






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






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






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






36. Returns the length of the string including escape sequences






37. Removes the first element of the array shift






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






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






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






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






42. Reverses the elements of the array






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






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






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






46. Remove trailing newline from each element in the array






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






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






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






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