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






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






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






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






5. Remove trailing newline from each element in the array






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






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






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






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






10. Removes the first element of the array shift






11. Sort and array alphabetically






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






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






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






15. Returns the length of the string including escape sequences






16. To write to a filehandle






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






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






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






20. 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






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






22. < - > - == - <= - >= - !=






23. Removes the last element from the array pop






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






25. Arrays can be assigned or read in _________






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






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






28. 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






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






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






31. Removes trailing newline






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






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






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






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






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






37. In arrays elements need not be __________






38. Split string into an array using spaces as delimeter






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






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


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






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






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






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






45. To include modules in perl






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






47. Reverses the elements of the array






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






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






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