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. Sort and array alphabetically






2. Common ___________: substr($string, $start, $numchars); - length($string) - lc($string) - uc($string) - chomp($string) - chomp(@string) - join(':", @string) - split(/\s/, $string) - lcfirst($string) - ucfirst($string)






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






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






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






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






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






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






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






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






11. Delete the hash entry with the key given






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






13. To write to a filehandle






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






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






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






17. < - > - == - <= - >= - !=






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






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






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






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






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






23. Split string into an array using spaces as delimeter






24. Removes the last element from the array pop






25. Remove trailing newline from each element in the array






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






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






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






29. Reverses the elements of the array






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






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






32. 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






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


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






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






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






37. In arrays elements need not be __________






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. _________ in perl - An associative array






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






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






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






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






44. Removes trailing newline






45. Removes the first element of the array shift






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






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






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






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






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