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






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






3. Split string into an array using spaces as delimeter






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






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






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






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






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






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






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






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






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






13. Removes trailing newline






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






15. Sort and array alphabetically






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






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






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






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






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






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






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






23. To write to a filehandle






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






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






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






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






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






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






30. 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






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






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






33. Removes the last element from the array pop






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






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






36. Reverses the elements of the array






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






38. 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






39. To include modules in perl






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






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






42. 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






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






44. In arrays elements need not be __________






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






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






47. Remove trailing newline from each element in the array






48. Returns the length of the string including escape sequences






49. Delete the hash entry with the key given






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






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