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 values of the hash as an array






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






3. 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






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






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






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






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






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


9. Removes the first element of the array shift






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






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






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






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






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






15. Delete the hash entry with the key given






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






17. Removes trailing newline






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






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






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






21. Remove trailing newline from each element in the array






22. Arrays can be assigned or read in _________






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






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






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






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






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






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






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






30. 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






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






32. To write to a filehandle






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






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






35. To include modules in perl






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






37. Split string into an array using spaces as delimeter






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






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






40. In arrays elements need not be __________






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






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






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






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






45. < - > - == - <= - >= - !=






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






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






48. _________ in perl - An associative array






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






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