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 a copy of the string with the first letter upper case






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






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






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






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






6. Arrays can be assigned or read in _________






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






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






9. 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






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






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






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






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






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






15. Does the hash key with "keyName" exists






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






17. Remove trailing newline from each element in the array






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


19. Split string into an array using spaces as delimeter






20. In arrays elements need not be __________






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






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






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






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






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






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






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






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






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






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






31. To include modules in perl






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






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






34. < - > - == - <= - >= - !=






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






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






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






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






39. Returns the length of the string including escape sequences






40. To write to a filehandle






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






42. 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






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






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






45. Reverses the elements of the array






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






47. _________ in perl - An associative array






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






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






50. Sort and array alphabetically