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. Sort and array alphabetically






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






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






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






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






6. < - > - == - <= - >= - !=






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






8. 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






9. Split string into an array using spaces as delimeter






10. In arrays elements need not be __________






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






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






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






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






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






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






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






18. Remove trailing newline from each element in the array






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






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






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






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






23. Reverses the elements of the array






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






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






26. Returns the length of the string including escape sequences






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






28. 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






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






30. 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






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






32. Does the hash key with "keyName" exists






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






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






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






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






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






38. Removes the first element of the array shift






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






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






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






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






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






44. Arrays can be assigned or read in _________






45. Removes trailing newline






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






47. Delete the hash entry with the key given






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






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






50. _________ in perl - An associative array