Added a lot of Oxford commas

[ci skip] A regular expression was used to find a lot of missing Oxford
commas and add them.  The regular expression was as follows.

", ([a-zA-Z0-9.\`:'\"]+ ){1,6}(or|and) "

1 files changed, 7 insertions, 7 deletions

diff --git a/guides/source/command_line.md b/guides/source/command_line.md
index b41e8bbec6..58a2d6d30f 100644
--- a/guides/source/command_line.md
+++ b/guides/source/command_line.md
@@ -161,7 +161,7 @@ $ bin/rails generate controller Greetings hello
      create      app/assets/stylesheets/greetings.scss
 ```
 
-What all did this generate? It made sure a bunch of directories were in our application, and created a controller file, a view file, a functional test file, a helper for the view, a JavaScript file and a stylesheet file.
+What all did this generate? It made sure a bunch of directories were in our application, and created a controller file, a view file, a functional test file, a helper for the view, a JavaScript file, and a stylesheet file.
 
 Check out the controller and modify it a little (in `app/controllers/greetings_controller.rb`):
 
@@ -329,7 +329,7 @@ With the `helper` method it is possible to access Rails and your application's h
 
 ### `rails dbconsole`
 
-`rails dbconsole` figures out which database you're using and drops you into whichever command line interface you would use with it (and figures out the command line parameters to give to it, too!). It supports MySQL (including MariaDB), PostgreSQL and SQLite3.
+`rails dbconsole` figures out which database you're using and drops you into whichever command line interface you would use with it (and figures out the command line parameters to give to it, too!). It supports MySQL (including MariaDB), PostgreSQL, and SQLite3.
 
 INFO: You can also use the alias "db" to invoke the dbconsole: `rails db`.
 
@@ -457,7 +457,7 @@ More information about migrations can be found in the [Migrations](active_record
 
 ### `notes`
 
-`bin/rails notes` will search through your code for comments beginning with FIXME, OPTIMIZE or TODO. The search is done in files with extension `.builder`, `.rb`, `.rake`, `.yml`, `.yaml`, `.ruby`, `.css`, `.js` and `.erb` for both default and custom annotations.
+`bin/rails notes` will search through your code for comments beginning with FIXME, OPTIMIZE, or TODO. The search is done in files with extension `.builder`, `.rb`, `.rake`, `.yml`, `.yaml`, `.ruby`, `.css`, `.js`, and `.erb` for both default and custom annotations.
 
 ```bash
 $ bin/rails notes
@@ -500,7 +500,7 @@ app/models/article.rb:
 
 NOTE. When using specific annotations and custom annotations, the annotation name (FIXME, BUG etc) is not displayed in the output lines.
 
-By default, `rails notes` will look in the `app`, `config`, `db`, `lib` and `test` directories. If you would like to search other directories, you can configure them using `config.annotations.register_directories` option.
+By default, `rails notes` will look in the `app`, `config`, `db`, `lib`, and `test` directories. If you would like to search other directories, you can configure them using `config.annotations.register_directories` option.
 
 ```ruby
 config.annotations.register_directories("spec", "vendor")
@@ -537,8 +537,8 @@ The `tmp:` namespaced tasks will help you clear and create the `Rails.root/tmp`
 * `rails tmp:cache:clear` clears `tmp/cache`.
 * `rails tmp:sockets:clear` clears `tmp/sockets`.
 * `rails tmp:screenshots:clear` clears `tmp/screenshots`.
-* `rails tmp:clear` clears all cache, sockets and screenshot files.
-* `rails tmp:create` creates tmp directories for cache, sockets and pids.
+* `rails tmp:clear` clears all cache, sockets, and screenshot files.
+* `rails tmp:create` creates tmp directories for cache, sockets, and pids.
 
 ### Miscellaneous
 
@@ -587,7 +587,7 @@ $ bin/rails "task_name[value 1]" # entire argument string should be quoted
 $ bin/rails db:nothing
 ```
 
-NOTE: If your need to interact with your application models, perform database queries and so on, your task should depend on the `environment` task, which will load your application code.
+NOTE: If your need to interact with your application models, perform database queries, and so on, your task should depend on the `environment` task, which will load your application code.
 
 The Rails Advanced Command Line
 -------------------------------