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






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






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






4. To write to a filehandle






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






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






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






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






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






10. Sort and array alphabetically






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






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






13. Removes trailing newline






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






15. 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






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






17. Arrays can be assigned or read in _________






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






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






20. 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






21. Returns the length of the string including escape sequences






22. _________ in perl - An associative array






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






24. To include modules in perl






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


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






27. 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






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






29. In arrays elements need not be __________






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






31. Remove trailing newline from each element in the array






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






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






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






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






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






37. Removes the last element from the array pop






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






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






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






41. Does the hash key with "keyName" exists






42. Split string into an array using spaces as delimeter






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






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






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






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






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






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






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






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