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. Explain how to read a line from a file handle






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






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






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






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






6. Split string into an array using spaces as delimeter






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






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






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






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






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






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






13. Removes trailing newline






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. A special system variable used to pass arguments to script






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






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






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






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






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 use of "if" "if-else" and "if-elsif-else"






22. To include modules in perl






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






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






25. Returns the length of the string including escape sequences






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






27. Delete the hash entry with the key given






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






29. To write to a filehandle






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






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






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






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






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






35. < - > - == - <= - >= - !=






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






37. Reverses the elements of the array






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






39. _________ in perl - An associative array






40. Sort and array alphabetically






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






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


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






44. Does the hash key with "keyName" exists






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






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






47. Removes the last element from the array pop






48. Removes the first element of the array shift






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






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