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. 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






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






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






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






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






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






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






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






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






10. To include modules in perl






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






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






13. Removes the last element from the array pop






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






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






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






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






18. _________ in perl - An associative array






19. Removes the first element of the array shift






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






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






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






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






24. 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






25. Delete the hash entry with the key given






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






27. Remove trailing newline from each element in the array






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






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






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






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






32. To write to a filehandle






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


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






35. Does the hash key with "keyName" exists






36. 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






37. Returns the length of the string including escape sequences






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






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






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






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






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






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






44. Split string into an array using spaces as delimeter






45. In arrays elements need not be __________






46. < - > - == - <= - >= - !=






47. Reverses the elements of the array






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






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






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