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. 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






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






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






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






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






6. Reverses the elements of the array






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






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


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






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






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






12. Removes the last element from the array pop






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






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






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






16. 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






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






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






19. In arrays elements need not be __________






20. Removes the first element of the array shift






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






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






23. 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






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






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






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






27. Arrays can be assigned or read in _________






28. Split string into an array using spaces as delimeter






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






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






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






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






33. Sort and array alphabetically






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






35. To write to a filehandle






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






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






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






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






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






41. Remove trailing newline from each element in the array






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






43. Returns the length of the string including escape sequences






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






45. _________ in perl - An associative array






46. To include modules in perl






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






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






49. Removes trailing newline






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