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brew install redis

# to have launchd start redis at login
ln -sfv /usr/local/opt/redis/*.plist ~/Library/LaunchAgents

# then to load redis now
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.redis.plist

# or if you don't want/need launchctl, you can just run
redis-server /usr/local/etc/redis.conf

brew install postgresql

# to have launchd start postgresql at login
ln -sfv /usr/local/opt/postgresql/*.plist ~/Library/LaunchAgents

# then to load postgresql now
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

# or if you don't want/need launchctl, you can just run
postgres -D /usr/local/var/postgres

brew install mysql

# to connect
mysql -uroot

# to load mysql
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist

# or if you don't want/need launchctl, you can just run
mysql.server start

brew install memcached

# To have launchd start memcached at login:
ln -sfv /usr/local/opt/memcached/*.plist ~/Library/LaunchAgents

# Then to load memcached now:
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.memcached.plist

# Or, if you don't want/need launchctl, you can just run:
/usr/local/opt/memcached/bin/memcached