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






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






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






4. Sort and array alphabetically






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






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






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






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






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






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






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






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






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






14. < - > - == - <= - >= - !=






15. Delete the hash entry with the key given






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






17. To include modules in perl






18. In arrays elements need not be __________






19. Returns the length of the string including escape sequences






20. 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






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






22. 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






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






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






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






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






27. Split string into an array using spaces as delimeter






28. Remove trailing newline from each element in the array






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






30. To write to a filehandle






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






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






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






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






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






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






37. 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






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






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






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






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






42. Removes trailing newline






43. Removes the last element from the array pop






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






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






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






47. Arrays can be assigned or read in _________






48. Removes the first element of the array shift






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






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