Invoking Rake

One rake command will build all the requested package formats
- tar, zip and gem in this example

tardis$ rake package
(in /home/jim/working/doc/talks/rubygemsfacets/src/builder)
mkdir -p pkg
[... lots of lines elided ...]
  Successfully built RubyGem
  Name: builder
  Version: 1.2.3
  File: builder-1.2.3.gem
mv builder-1.2.3.gem pkg/builder-1.2.3.gem
tardis$ ls pkg
builder-1.2.3      builder-1.2.3.gem  
builder-1.2.3.tgz  builder-1.2.3.zip