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






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






5. Does the hash key with "keyName" exists






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






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






8. To include modules in perl






9. 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






10. 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






11. Removes the last element from the array pop






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






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






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






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






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






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






18. Removes trailing newline






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






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






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






22. Sort and array alphabetically






23. Arrays can be assigned or read in _________






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






25. To write to a filehandle






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






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






28. < - > - == - <= - >= - !=






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






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






31. Removes the first element of the array shift






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






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






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






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






36. Split string into an array using spaces as delimeter






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






38. In arrays elements need not be __________






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






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






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






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






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






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 variable that provides the last index of an array






46. Returns the length of the string including escape sequences






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






48. _________ in perl - An associative array






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






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