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






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






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






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






5. Remove trailing newline from each element in the array






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






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






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






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






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






11. Reverses the elements of the array






12. Delete the hash entry with the key given






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






14. Removes the last element from the array pop






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






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






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






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






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






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






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






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






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






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






25. _________ in perl - An associative array






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






27. In arrays elements need not be __________






28. Split string into an array using spaces as delimeter






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






30. < - > - == - <= - >= - !=






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






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






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






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






35. 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






36. Returns the length of the string including escape sequences






37. 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






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






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






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






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






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






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






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






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






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


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






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






49. Arrays can be assigned or read in _________






50. To include modules in perl