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






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






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






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






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






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






7. Does the hash key with "keyName" exists






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






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






10. Remove trailing newline from each element in the array






11. < - > - == - <= - >= - !=






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






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






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






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






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






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






18. Arrays can be assigned or read in _________






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






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






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






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






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






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






25. Split string into an array using spaces as delimeter






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






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






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






29. 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






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






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






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






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






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






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






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






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






38. Returns the length of the string including escape sequences






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






40. Reverses the elements of the array






41. In arrays elements need not be __________






42. 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






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






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


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






46. Removes the first element of the array shift






47. Removes trailing newline






48. To include modules in perl






49. To write to a filehandle






50. 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