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






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






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






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






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






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






7. Removes the last element from the array pop






8. 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






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






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






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






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






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






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






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






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






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






18. _________ in perl - An associative array






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






20. In arrays elements need not be __________






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






22. Delete the hash entry with the key given






23. Removes the first element of the array shift






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






25. Sort and array alphabetically






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






27. Reverses the elements of the array






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






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






30. 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






31. Arrays can be assigned or read in _________






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






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






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






35. Remove trailing newline from each element in the array






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






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






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






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






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






41. Returns the length of the string including escape sequences






42. To include modules in perl






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






44. < - > - == - <= - >= - !=






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






46. Does the hash key with "keyName" exists






47. To write to a filehandle






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






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






50. Split string into an array using spaces as delimeter