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. Removes trailing newline






3. Delete the hash entry with the key given






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






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






6. Sort and array alphabetically






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






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






9. Returns the length of the string including escape sequences






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






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






12. 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






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






14. Removes the first element of the array shift






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






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






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






18. Remove trailing newline from each element in the array






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






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






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






22. 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






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






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






25. Reverses the elements of the array






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






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






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






29. 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






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






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


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






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






34. To write to a filehandle






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






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






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






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






39. Removes the last element from the array pop






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






41. To include modules in perl






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






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






44. _________ in perl - An associative array






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






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






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






48. < - > - == - <= - >= - !=






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






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