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. Removes the last element from the array pop






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






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






4. 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






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






6. Remove trailing newline from each element in the array






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






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






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






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






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






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






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






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






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






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






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






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






19. Arrays can be assigned or read in _________






20. Split string into an array using spaces as delimeter






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






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






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


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






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






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






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






28. To write to a filehandle






29. _________ in perl - An associative array






30. 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






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






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






33. < - > - == - <= - >= - !=






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






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






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






37. Sort and array alphabetically






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






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






40. Does the hash key with "keyName" exists






41. Reverses the elements of the array






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






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






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






45. Delete the hash entry with the key given






46. In arrays elements need not be __________






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






48. To include modules in perl






49. 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






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