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. Delete the hash entry with the key given






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






3. Does the hash key with "keyName" exists






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






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






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






7. In arrays elements need not be __________






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






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






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






11. 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






12. To include modules in perl






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






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






15. Arrays can be assigned or read in _________






16. Reverses the elements of the array






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






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






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






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






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






22. Remove trailing newline from each element in the array






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






24. _________ in perl - An associative array






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






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






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






28. Removes the first element of the array shift






29. 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


30. To write to a filehandle






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






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






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






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






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






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






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






39. Removes the last element from the array pop






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






41. Removes trailing newline






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






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






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






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






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






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






49. 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






50. Split string into an array using spaces as delimeter