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






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






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






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






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






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






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






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






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






11. To include modules in perl






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






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






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






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






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






17. Removes the first element of the array shift






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






19. _________ in perl - An associative array






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






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






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






23. Returns the length of the string including escape sequences






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






25. Split string into an array using spaces as delimeter






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






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






28. 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






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






30. Remove trailing newline from each element in the array






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






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






33. Delete the hash entry with the key given






34. Removes trailing newline






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






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






37. Arrays can be assigned or read in _________






38. To write to a filehandle






39. Sort and array alphabetically






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






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






42. Reverses the elements of the array






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






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






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






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






47. Does the hash key with "keyName" exists






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






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






50. 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