Update custom location command and fix code format

README.markdown

@@ -25,11 +25,15 @@ Oh My Zsh is installed by running one of the following commands in your terminal
 
 #### via curl
 
-`sh -c "$(curl -fsSL https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"`
+```shell
+sh -c "$(curl -fsSL https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"
+```
 
 #### via wget
 
-`sh -c "$(wget https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh -O -)"`
+```shell
+sh -c "$(wget https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh -O -)"
+```
 
 ## Using Oh My Zsh
 
@@ -100,7 +104,7 @@ The default location is `~/.oh-my-zsh` (hidden in your home directory)
 If you'd like to change the install directory with the `ZSH` environment variable, either by running `export ZSH=/your/path` before installing, or by setting it before the end of the install pipeline like this:
 
 ```shell
-curl -L https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh | ZSH=~/.dotfiles/zsh sh
+export ZSH="~/.dotfiles/oh-my-zsh"; sh -c "$(curl -fsSL https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"
 ```
 
 #### Manual Installation