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rake -h    - help

rake -T    - task   

db:create creates the database for the current env
db:create:all creates the databases for all envs
db:drop drops the database for the current env
db:drop:all drops the databases for all envs
db:migrate runs migrations for the current env that have not run yet
db:migrate:up runs one specific migration
db:migrate:down rolls back one specific migration
db:migrate:status shows current migration status
db:rollback rolls back the last migration
db:forward advances the current schema version to the next one
db:seed (only) runs the db/seed.rb file
db:schema:load loads the schema into the current env's database
db:schema:dump dumps the current env's schema (and seems to create the db as well)

db:setup runs db:schema:load, db:seed

db:reset runs db:drop db:setup
db:migrate:redo runs (db:migrate:down db:migrate:up) or (db:rollback db:migrate:migrate) depending on the specified migration
db:migrate:reset runs db:drop db:create db:migrate

ruby -v - ruby version

clear  - clear everything

ruby hello.rb   - run program hello.rb

rails server - run server
control c    - exiting server

cd desktop   - got to folder
cd ..        - go up on folder

kill port server
run
lsof -i tcp:3000

look for the PID and run (PID = 42781)
kill -9 42781

ruby generate h-  - generate help    

Create a new controller
rails g controller site home

it creates a new controller class site with def home

rails s -p 4000 check the app on the port 4000