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. Split string into an array using spaces as delimeter






3. 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






4. To write to a filehandle






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






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






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






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






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






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






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






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






13. In arrays elements need not be __________






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






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






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






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






18. 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






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






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






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






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






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






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






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






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






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






28. Reverses the elements of the array






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






31. Returns the length of the string including escape sequences






32. Removes trailing newline






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






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






35. < - > - == - <= - >= - !=






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






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






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






39. Remove trailing newline from each element in the array






40. 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






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






42. Delete the hash entry with the key given






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






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






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






46. To include modules in perl






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






48. Arrays can be assigned or read in _________






49. Removes the first element of the array shift






50. Removes the last element from the array pop