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






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






3. _________ in perl - An associative array






4. 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






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






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






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


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






9. To write to a filehandle






10. Removes the first element of the array shift






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






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






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






14. Remove trailing newline from each element in the array






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






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






17. 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






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






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






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






21. < - > - == - <= - >= - !=






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






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






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






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






26. Removes trailing newline






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






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






29. Reverses the elements of the array






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






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






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






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






34. Split string into an array using spaces as delimeter






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






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






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






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






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






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






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






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






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






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






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. Arrays can be assigned or read in _________






47. Delete the hash entry with the key given






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






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






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