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. Explain how to read a line from a file handle






2. Split string into an array using spaces as delimeter






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






4. Removes the last element from the array pop






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






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






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






8. 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






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






10. Remove trailing newline from each element in the array






11. Does the hash key with "keyName" exists






12. To write to a filehandle






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






14. Returns the length of the string including escape sequences






15. Removes trailing newline






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






17. To include modules in perl






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






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






20. < - > - == - <= - >= - !=






21. Delete the hash entry with the key given






22. Arrays can be assigned or read in _________






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






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






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






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






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






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






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






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






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






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






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






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


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






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






37. 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






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






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






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






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






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






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






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






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






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






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






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






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






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