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






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






3. Removes trailing newline






4. To include modules in perl






5. 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






6. Arrays can be assigned or read in _________






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






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






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






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






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






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






13. Removes the first element of the array shift






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






15. Reverses the elements of the array






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






31. < - > - == - <= - >= - !=






32. Does the hash key with "keyName" exists






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






34. To write to a filehandle






35. Delete the hash entry with the key given






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






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






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






39. Sort and array alphabetically






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






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






42. _________ in perl - An associative array






43. Returns the length of the string including escape sequences






44. In arrays elements need not be __________






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






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






47. Split string into an array using spaces as delimeter






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






49. Remove trailing newline from each element in the array






50. 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