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 all of the keys of the hash as an array






2. Returns the length of the string including escape sequences






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






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






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






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






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






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






9. 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






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






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






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






13. Reverses the elements of the array






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






15. _________ in perl - An associative array






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






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






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






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






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






21. 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






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






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






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






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






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






27. Remove trailing newline from each element in the array






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






29. To write to a filehandle






30. Sort and array alphabetically






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






32. Removes the first element of the array shift






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






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






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






36. Does the hash key with "keyName" exists






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






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


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






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






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






42. To include modules in perl






43. 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






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






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






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






47. Removes the last element from the array pop






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






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






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