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






2. Delete the hash entry with the key given






3. Remove trailing newline from each element in the array






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






5. Does the hash key with "keyName" exists






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






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






8. To include modules in perl






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






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






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






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






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






14. Returns the length of the string including escape sequences






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






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






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






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






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






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






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






22. To write to a filehandle






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






24. 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






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






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






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






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






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






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






31. Reverses the elements of the array






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






33. Split string into an array using spaces as delimeter






34. In arrays elements need not be __________






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






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






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






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






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






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






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






42. Removes the last element from the array pop






43. Sort and array alphabetically






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






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






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






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






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






49. < - > - == - <= - >= - !=






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