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






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






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






4. 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






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






6. 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






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






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






9. _________ in perl - An associative array






10. Returns the length of the string including escape sequences






11. To include modules in perl






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






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






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






15. Removes the first element of the array shift






16. In arrays elements need not be __________






17. Delete the hash entry with the key given






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






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






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






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


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






23. Reverses the elements of the array






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






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






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






27. Split string into an array using spaces as delimeter






28. Remove trailing newline from each element in the array






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






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






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






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






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






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






35. Removes the last element from the array pop






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






37. Does the hash key with "keyName" exists






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






39. 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






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






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






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






43. Removes trailing newline






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






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






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






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






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






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






50. < - > - == - <= - >= - !=