Can I do a dry run with homebrew to see the details of what will be installed and how?

Is it possible to run in a verbose mode where it doesn't actually install the package, but just details from where and how it will be install the package?开发者_如何学Python

You can run brew outdated to see a list of outdated packages that will be upgraded when running brew upgrade.

The closest you'll find is to show the dependencies of the package you're trying to install:

$ brew deps ruby

Will list the packages of ruby. You can then use:

$ brew list

to see which packages you have installed. From these two commands, you will be able to tell which packages will be installed by brew install ruby

I've used gentoo linux quite a bit in the past, and their portage system has a nice 'pretend' option for installing packages, the closest I've found for brew is:

brew list (package name)

brew list ruby gives me:

/usr/local/Cellar/ruby/1.9.2-p0/bin/tilt
/usr/local/Cellar/ruby/1.9.2-p0/bin/testrb
/usr/local/Cellar/ruby/1.9.2-p0/bin/ruby
/usr/local/Cellar/ruby/1.9.2-p0/bin/ri
/usr/local/Cellar/ruby/1.9.2-p0/bin/rdoc
/usr/local/Cellar/ruby/1.9.2-p0/bin/rake
/usr/local/Cellar/ruby/1.9.2-p0/bin/rackup
/usr/local/Cellar/ruby/1.9.2-p0/bin/irb
/usr/local/Cellar/ruby/1.9.2-p0/bin/gem
/usr/local/Cellar/ruby/1.9.2-p0/bin/erb
/usr/local/Cellar/ruby/1.9.2-p0/include/ruby-1.9.1/ (21 files)
/usr/local/Cellar/ruby/1.9.2-p0/lib/libruby.1.9.1.dylib
/usr/local/Cellar/ruby/1.9.2-p0/lib/ruby/ (998 files)
/usr/local/Cellar/ruby/1.9.2-p0/lib/ (3 other files)
/usr/local/Cellar/ruby/1.9.2-p0/share/man/ (5 files)
/usr/local/Cellar/ruby/1.9.2-p0/share/ri/ (9522 files)

But I'm guessing you're looking for more info than this?

The brew install --dry-run feature was recently added.

brew install --dry-run vim
==> Would install 1 formula:
vim
==> Would install 5 dependencies for vim:
lua berkeley-db perl libyaml ruby