docs/Installation: update commands for untar-anywhere method

docs/Homebrew-on-Linux.md

@@ -78,17 +78,6 @@ You may need to install your own Ruby using your system package manager, a PPA,
 
 Homebrew does not currently support 32-bit x86 platforms. It would be possible for Homebrew to work on 32-bit x86 platforms with some effort. An interested and dedicated person could maintain a fork of Homebrew to develop support for 32-bit x86.
 
-## Alternative Installation
-
-Extract or `git clone` Homebrew wherever you want. Use `/home/linuxbrew/.linuxbrew` if possible (to enable the use of binary packages).
-
-```sh
-git clone https://github.com/Homebrew/brew ~/.linuxbrew/Homebrew
-mkdir ~/.linuxbrew/bin
-ln -s ~/.linuxbrew/Homebrew/bin/brew ~/.linuxbrew/bin
-eval "$(~/.linuxbrew/bin/brew shellenv)"
-```
-
 ## Homebrew on Linux Community
 
 - [@HomebrewOnLinux on Twitter](https://twitter.com/HomebrewOnLinux)

docs/Installation.md

@@ -53,6 +53,20 @@ here. *Pick another prefix at your peril!*
 mkdir homebrew && curl -L https://github.com/Homebrew/brew/tarball/master | tar xz --strip 1 -C homebrew
 ```
 
+or
+
+```sh
+git clone https://github.com/Homebrew/brew homebrew
+```
+
+then
+
+```sh
+eval "$(homebrew/bin/brew shellenv)"
+brew update --force --quiet
+chmod -R go-w "$(brew --prefix)/share/zsh"
+```
+
 ### Multiple installations
 
 Create a Homebrew installation wherever you extract the tarball. Whichever `brew` command is called is where the packages will be installed. You can use this as you see fit, e.g. a system set of libs in the default prefix and tweaked formulae for development in `~/homebrew`.