git status in homebrew installation

gistfile1.txt

Dan-Yangs-MacBook-Pro:local dsyang$ pwd
/usr/local
Dan-Yangs-MacBook-Pro:local dsyang$ git status
# On branch master
# Changes not staged for commit:
#   (use "git add/rm <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
#	modified:   Library/Formula/atk.rb
#	modified:   Library/Formula/bazaar.rb
#	modified:   Library/Formula/hydra.rb
#	modified:   Library/Formula/libtorrent.rb
#	modified:   Library/Formula/mutt.rb
#	deleted:    Library/Formula/nesc.rb
#	modified:   Library/Formula/rtorrent.rb
#	modified:   Library/Formula/tbb.rb
#	modified:   Library/Homebrew/cmd/install.rb
#	modified:   Library/Homebrew/cmd/list.rb
#	modified:   Library/Homebrew/formula.rb
#	modified:   bin/brew
#
no changes added to commit (use "git add" and/or "git commit -a")