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

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You can run brew outdated to see a list of outdated packages that will be upgraded when running brew upgrade.

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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

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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?

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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