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 _______ 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






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






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






4. Arrays can be assigned or read in _________






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






6. To write to a filehandle






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






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






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






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






11. Reverses the elements of the array






12. In arrays elements need not be __________






13. Removes the last element from the array pop






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






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






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






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






18. Delete the hash entry with the key given






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






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






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






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






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






25. To include modules in perl






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






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






28. Removes the first element of the array shift






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






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






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






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






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






34. Split string into an array using spaces as delimeter






35. Removes trailing newline






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






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






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






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






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






41. Remove trailing newline from each element in the array






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






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






44. Does the hash key with "keyName" exists






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






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


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






48. Returns the length of the string including escape sequences






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






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