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. Returns the length of the string including escape sequences






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






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






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






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






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






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






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






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






10. Sort and array alphabetically






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






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






13. Split string into an array using spaces as delimeter






14. To write to a filehandle






15. Arrays can be assigned or read in _________






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






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






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






19. 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






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






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






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






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






24. To include modules in perl






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






26. 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






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






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






29. Removes the first element of the array shift






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






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






32. Removes trailing newline






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






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






35. < - > - == - <= - >= - !=






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






37. Does the hash key with "keyName" exists






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






39. 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






40. Remove trailing newline from each element in the array






41. _________ in perl - An associative array






42. Reverses the elements of the array






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






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






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






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






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






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






49. Delete the hash entry with the key given






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