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 arrays elements need not be __________






2. Delete the hash entry with the key given






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






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






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






6. Split string into an array using spaces as delimeter






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






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






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






10. To include modules in perl






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






12. Returns the length of the string including escape sequences






13. Reverses the elements of the array






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






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






16. Arrays can be assigned or read in _________






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






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






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






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






21. 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






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






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






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






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






26. 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






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






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






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






30. _________ in perl - An associative array






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






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






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






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






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






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

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






38. Sort and array alphabetically






39. < - > - == - <= - >= - !=






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






41. To write to a filehandle






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






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






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






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






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






47. 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






48. Removes the first element of the array shift






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






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