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






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


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






4. Removes the last element from the array pop






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






6. 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






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






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






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






10. Remove trailing newline from each element in the array






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






12. Removes the first element of the array shift






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






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






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






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






17. Does the hash key with "keyName" exists






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






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






20. 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






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






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






23. Delete the hash entry with the key given






24. Returns the length of the string including escape sequences






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






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






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






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






29. To include modules in perl






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






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






32. 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






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






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






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






36. _________ in perl - An associative array






37. To write to a filehandle






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






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






40. Reverses the elements of the array






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






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






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






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






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






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






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






48. Removes trailing newline






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






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