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






2. Removes trailing newline






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






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






5. To include modules in perl






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






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






8. Sort and array alphabetically






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






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






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






12. Removes the last element from the array pop






13. 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






14. Removes the first element of the array shift






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






16. _________ @arrayName) returns the size of 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. A special system variable used to pass arguments to script






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






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






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






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






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






24. To write to a filehandle






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






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






27. _________ in perl - An associative array






28. Returns the length of the string including escape sequences






29. Split string into an array using spaces as delimeter






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






31. 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






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






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






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






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






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






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






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






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






40. In arrays elements need not be __________






41. Remove trailing newline from each element in the array






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






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






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






45. 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






46. Reverses the elements of the array






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






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






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






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