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






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






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






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






5. Does the hash key with "keyName" exists






6. In arrays elements need not be __________






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






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






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






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






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






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


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






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






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






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






17. Returns the length of the string including escape sequences






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






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






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






21. Arrays can be assigned or read in _________






22. _________ in perl - An associative array






23. < - > - == - <= - >= - !=






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






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






26. Removes the last element from the array pop






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






28. Delete the hash entry with the key given






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






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






31. 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






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






33. Remove trailing newline from each element in the array






34. 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






35. 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






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






37. To write to a filehandle






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






39. Reverses the elements of the array






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






41. To include modules in perl






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






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






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






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






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






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






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






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






50. Removes the first element of the array shift