Typically deploying the latest trunk version is done by issuing the command

cap <environment> deploy:migrations 

where <environment> can be either staging or production.

The above command needs to be run from the application directory. Also ensure that 'capistrano' gem is installed on your machine. At present, the deploy is done with user 'expdevl'. You need to provide the password for this user while deploying.

To list the other cap commands

cap -T

A bunch of questions:
1. how do we do a deploy in a production environment where we have multiple application servers (and one read/write database server)
2. will the deploy start from the source code machine?
3. how do you specify the target machine(s)?
4. how do you deploy a particular label?
https://github.com/capistrano/capistrano/wiki/2.x-From-The-Beginning