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 two phases of creating a PERL program _______ - Execution






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






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






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






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






6. Removes trailing newline






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






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






9. Removes the first element of the array shift






10. Remove trailing newline from each element in the array






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






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






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


14. Reverses the elements of the array






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






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






17. Split string into an array using spaces as delimeter






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






19. 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






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






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






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






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






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






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






26. 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






27. To include modules in perl






28. To write to a filehandle






29. Returns the length of the string including escape sequences






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






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






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






33. Sort and array alphabetically






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






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






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






37. In arrays elements need not be __________






38. 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






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






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






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






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






43. Removes the last element from the array pop






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






45. _________ in perl - An associative array






46. Does the hash key with "keyName" exists






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






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






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






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