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






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






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






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






6. Removes the first element of the array shift






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






8. To write to a filehandle






9. Removes trailing newline






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






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






12. Removes the last element from the array pop






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






14. 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






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






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






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


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






19. < - > - == - <= - >= - !=






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






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






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






23. 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






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






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






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






27. 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






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






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






30. To include modules in perl






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






32. Split string into an array using spaces as delimeter






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






34. Sort and array alphabetically






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






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






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






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






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






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






41. Delete the hash entry with the key given






42. Remove trailing newline from each element in the array






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






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






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






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






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






48. In arrays elements need not be __________






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






50. Arrays can be assigned or read in _________