Source: https://www.topbug.net/blog/2013/04/14/install-and-use-gnu-command-line-tools-in-mac-os-x/

install_gnutools_via_brew_on_mac.sh

#!/bin/bash
# Source: https://www.topbug.net/blog/2013/04/14/install-and-use-gnu-command-line-tools-in-mac-os-x/

# First comes the most important one -- GNU Coreutils:

brew install coreutils

# Then you may probably want to install the following ones (For some of the packages, you need to run brew tap homebrew/dupes first, but only once for your system):

brew install binutils
brew install homebrew/dupes/diffutils
brew install ed --default-names
brew install findutils --with-default-names
brew install gawk
brew install gnu-indent --with-default-names
brew install gnu-sed --with-default-names
brew install gnu-tar --with-default-names
brew install gnu-which --with-default-names
brew install gnutls
brew install grep --with-default-names
brew install gzip
brew install screen
brew install watch
brew install wdiff --with-gettext
brew install wget

# The --default-names option will prevent Homebrew from prepending gs to the newly installed commands, thus we could use these commands as default ones over the ones shipped by OS X.
#
# Some command line tools already exist on OS X, but you may wanna a newer version:

brew install bash
brew install emacs
brew install gdb  # gdb requires further actions to make it work. See `brew info gdb`.
brew install gpatch
brew install m4
brew install make
brew install nano

# As a complementary set of packages, the following ones are not from GNU, but you can install and use a newer version instead of the version shipped by OS X:

brew install file-formula
brew install git
brew install less
brew install openssh
brew install perl518   # must run "brew tap homebrew/versions" first!
brew install python
brew install rsync
brew install svn
brew install unzip
brew install vim --override-system-vi
brew install macvim --override-system-vim --custom-system-icons
brew install zsh