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






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






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






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






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






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






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






8. < - > - == - <= - >= - !=






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






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






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






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






13. Reverses the elements of the array






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






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






16. To include modules in perl






17. 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






18. Arrays can be assigned or read in _________






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






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






21. Does the hash key with "keyName" exists






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






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






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






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






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






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






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






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






30. 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






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






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






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






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






35. Sort and array alphabetically






36. Delete the hash entry with the key given






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






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






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






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


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






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






43. 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






44. Returns the length of the string including escape sequences






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






46. Split string into an array using spaces as delimeter






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






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






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






50. In arrays elements need not be __________