I prefer the application that I'm currently working on to be reachable at http://localhost/.

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So when I switch to another project, I use this handy shell script to set one site as the current one. Call it just like this:
apache-site makandra-com

Note that it disables all other sites in your Apache configuration so you would not want to use this on production machines.
Furthermore it will also enable the default site if that was available.

When you call apache-site with no arguments, it will list all available sites.

This script is part of our geordi gem on github Show archive.org snapshot .