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






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






3. To include modules in perl






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






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






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






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






8. Split string into an array using spaces as delimeter






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






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


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






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






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






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






15. Removes the last element from the array pop






16. < - > - == - <= - >= - !=






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






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






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






20. Removes the first element of the array shift






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






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






23. Delete the hash entry with the key given






24. 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






25. To write to a filehandle






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






27. Sort and array alphabetically






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






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






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






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






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






33. Remove trailing newline from each element in the array






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






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






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






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






38. Arrays can be assigned or read in _________






39. _________ in perl - An associative array






40. 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






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






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






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






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






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






46. Does the hash key with "keyName" exists






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






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






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






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