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






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






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






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






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






6. Reverses the elements of the array






7. Removes trailing newline






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






9. In arrays elements need not be __________






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






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






12. Remove trailing newline from each element in the array






13. < - > - == - <= - >= - !=






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






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






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






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






18. 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






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






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






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






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






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






24. Sort and array alphabetically






25. _________ in perl - An associative array






26. Split string into an array using spaces as delimeter






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






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






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






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






31. Removes the last element from the array pop






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






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






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






35. Returns the length of the string including escape sequences






36. To write to a filehandle






37. Delete the hash entry with the key given






38. To include modules in perl






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






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






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






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






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






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






45. Removes the first element of the array shift






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






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






48. 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






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






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