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






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






3. 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






4. < - > - == - <= - >= - !=






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






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






7. Does the hash key with "keyName" exists






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






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






10. In arrays elements need not be __________






11. Delete the hash entry with the key given






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






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






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






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






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






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






18. Removes the first element of the array shift






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






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






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






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






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






24. Remove trailing newline from each element in the array






25. Returns the length of the string including escape sequences






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






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






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






29. Sort and array alphabetically






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






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






32. 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






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






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






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






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






37. 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






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






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






40. Removes trailing newline






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






42. Removes the last element from the array pop






43. Split string into an array using spaces as delimeter






44. To write to a filehandle






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






46. 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


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






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






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






50. _________ in perl - An associative array