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






2. 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






3. In arrays elements need not be __________






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






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






6. Arrays can be assigned or read in _________






7. Delete the hash entry with the key given






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






9. Removes trailing newline






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






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






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






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






14. Reverses the elements of the array






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






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






17. 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






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






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






20. To include modules in perl






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






22. 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


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






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






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






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






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






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






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






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






31. Split string into an array using spaces as delimeter






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






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






34. Removes the last element from the array pop






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






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






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






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






39. Removes the first element of the array shift






40. To write to a filehandle






41. _________ in perl - An associative array






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






43. < - > - == - <= - >= - !=






44. Does the hash key with "keyName" exists






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






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






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






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






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






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







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Can you answer 50 questions in 15 minutes?


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