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http://samuelstern.wordpress.com/2012/11/28/making-a-simple-database-driven-website-with-sinatra-and-heroku/
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Tutorial regarding how to create an application using sinatra and postgres

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http://stackoverflow.com/questions/7975556/how-to-start-postgresql-server-on-mac-os-x
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how to start postgres server
  (information can also be obtained using `brew info postgres`
  pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start
how to stop postgres server
  pg_ctl -D /usr/lcoal/var/postgres stop -s -m fast
how to get status of server
  pg_ctl -D /usr/local/var/postgres status
get listen addresses
  egrep 'listen|port' /usr/local/var/postgres/postgresql.conf

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http://alvinalexander.com/blog/post/postgresql/how-start-postgres-postgresql-server-mac-osx
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to create a database
  createdb [database-name]

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http://alvinalexander.com/blog/post/postgresql/log-in-postgresql-database
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to connect to the database 'development'
  psql development
to force psql to prompt for password
  psql -d development -U [username] -W

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http://superuser.com/questions/324616/how-should-i-set-the-path-variable-on-my-mac-so-the-hombrew-installed-tools-are
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Describes how to force OS to use brew-installed tools rather than default tools