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






2. Reverses the elements of the array






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






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






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






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






7. Removes trailing newline






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






9. Removes the first element of the array shift






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






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






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






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


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






15. Removes the last element from the array pop






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






17. In arrays elements need not be __________






18. < - > - == - <= - >= - !=






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






20. Delete the hash entry with the key given






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






22. Remove trailing newline from each element in the array






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






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






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






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






27. Arrays can be assigned or read in _________






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






29. Returns the length of the string including escape sequences






30. 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






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






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






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






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






35. _________ in perl - An associative array






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






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






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






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






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






41. To include modules in perl






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






43. Split string into an array using spaces as delimeter






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






45. To write to a filehandle






46. Sort and array alphabetically






47. 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






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






49. Does the hash key with "keyName" exists






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