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. 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






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






3. Does the hash key with "keyName" exists






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






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






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






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






8. 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






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






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






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






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






13. To include modules in perl






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






15. 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






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






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






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






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






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






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






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






23. Returns the length of the string including escape sequences






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






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






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






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






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






29. In arrays elements need not be __________






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






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






32. Remove trailing newline from each element in the array






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






34. Sort and array alphabetically






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






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






37. Split string into an array using spaces as delimeter






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






39. Removes the last element from the array pop






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






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






42. Reverses the elements of the array






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






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






45. < - > - == - <= - >= - !=






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






47. Removes trailing newline






48. _________ in perl - An associative array






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






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