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 a copy of the string with the first letter upper case






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






3. To include modules in perl






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






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






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






7. 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






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






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






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






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






12. Returns the length of the string including escape sequences






13. Remove trailing newline from each element in the array






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






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






16. Removes trailing newline






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






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






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






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






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






22. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program






23. 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






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






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






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






27. Delete the hash entry with the key given






28. Arrays can be assigned or read in _________






29. Does the hash key with "keyName" exists






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






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






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






33. < - > - == - <= - >= - !=






34. _________ in perl - An associative array






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






36. In arrays elements need not be __________






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






38. Reverses the elements of the array






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






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






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






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






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






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






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






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






47. Removes the last element from the array pop






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






49. Split string into an array using spaces as delimeter






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