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






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






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






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






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






6. Split string into an array using spaces as delimeter






7. Removes the first element of the array shift






8. Arrays can be assigned or read in _________






9. In arrays elements need not be __________






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






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






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






13. Sort and array alphabetically






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






15. To include modules in perl






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






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






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






19. _________ in perl - An associative array






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






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






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






25. Returns the length of the string including escape sequences






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






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






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






29. Remove trailing newline from each element in the array






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






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






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






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






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






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






36. Reverses the elements of the array






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






38. To write to a filehandle






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






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






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






42. 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






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






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






45. Delete the hash entry with the key given






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






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






48. Removes the last element from the array pop






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






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