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 two phases of creating a PERL program _______ - Execution






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






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






4. To write to a filehandle






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






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






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






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






9. Reverses the elements of the array






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






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






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






13. Arrays can be assigned or read in _________






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






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






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






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






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






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






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






21. Sort and array alphabetically






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






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






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






25. 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






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






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






28. In arrays elements need not be __________






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






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






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






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






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






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






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






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


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






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






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






40. 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






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






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






43. Removes the first element of the array shift






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






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






46. Removes trailing newline






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






48. Delete the hash entry with the key given






49. Split string into an array using spaces as delimeter






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