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. Assignment of a hash variable for a single hash element






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






3. Removes the last element from the array pop






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






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






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






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






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






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






10. Delete the hash entry with the key given






11. < - > - == - <= - >= - !=






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






13. Arrays can be assigned or read in _________






14. Returns the length of the string including escape sequences






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






16. Remove trailing newline from each element in the array






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






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






19. 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






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






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






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






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






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






25. 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






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






27. In arrays elements need not be __________






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






29. Reverses the elements of the array






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






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






32. To write to a filehandle






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






34. _________ in perl - An associative array






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






36. The __________ in perl: - uses grave marks `command args`- returns the output of the command to the variable you specify - if $output = `command arg` the output is stored all in one variable (all lines seperated by n) - if @output = `command arg` the






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






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






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






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






41. Does the hash key with "keyName" exists






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






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






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






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






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






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






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






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






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