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. Arrays can be assigned or read in _________






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






3. To include modules in perl






4. Removes trailing newline






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






6. In arrays elements need not be __________






7. Remove trailing newline from each element in the array






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






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






10. 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






11. _________ in perl - An associative array






12. To write to a filehandle






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






14. Removes the last element from the array pop






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






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






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






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






19. Split string into an array using spaces as delimeter






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






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






22. Returns the length of the string including escape sequences






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






24. Delete the hash entry with the key given






25. Sort and array alphabetically






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






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






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






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






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






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






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






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






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






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






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


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






38. Reverses the elements of the array






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






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






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






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






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






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






45. 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






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






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






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






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






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