change install nignx doc

Author: yanue

nginx-install.md

@@ -2,38 +2,45 @@ nginx install
 ============
 0. before ready
 ---------------
+```bash
 groupadd www
 useradd -g www www -s /bin/false
 
 yum install -y gcc gcc-c++ zlib zlib-devel openssl openssl-devel pcre pcre-devel
 yum install -y libpng libjpeg libpng-devel libjpeg-devel ghostscript libtiff libtiff-devel freetype freetype-devel
-
+```
 1. download software
 --------------------
-/usr/local/src
+```bash
+cd /usr/local/src
+```
 ### base download
+```bash
 wget http://nginx.org/download/nginx-1.8.0.tar.gz
 wget http://luajit.org/download/LuaJIT-2.0.4.tar.gz ### LuaJIT
 wget ftp://ftp.graphicsmagick.org/pub/GraphicsMagick/1.3/GraphicsMagick-1.3.21.tar.gz ### GraphicsMagick
 wget http://zlib.net/zlib-1.2.8.tar.gz
-
+```
 ### nginx module 
+```bash
 git clone https://github.com/alibaba/nginx-http-concat.git
 git clone https://github.com/simpl/ngx_devel_kit.git
 git clone https://github.com/openresty/echo-nginx-module.git
 git clone https://github.com/openresty/lua-nginx-module.git
 git clone https://github.com/happyfish100/fastdfs-nginx-module.git
-
+```
 2. unzip and install depends
 ------------------------------
 
 #### 2.0 unzip 
+```bash
 tar -zxf nginx-1.8.0.tar.gz
 tar -zxf LuaJIT-2.0.4.tar.gz
 tar -zxf GraphicsMagick-1.3.21.tar.gz
 tar -zxf zlib-1.2.8.tar.gz
-
+```
 #### 2.1 install LuaJIT
+```bash
 cd LuaJIT-2.0.4
 ./configure --with-ld-opt="-Wl,-rpath,$LUAJIT_LIB"
 make -j8
@@ -42,15 +49,17 @@ export LUAJIT_LIB=/usr/local/lib
 export LUAJIT_INC=/usr/local/include/luajit-2.0
 ln -s /usr/local/lib/libluajit-5.1.so.2 /lib64/libluajit-5.1.so.2
 cd ..
-
+```
 #### 2.2 install GraphicsMagick
+```bash
 cd GraphicsMagick-1.3.21
 ./configure --enable-shared --with-jpeg=yes  --with-png=yes
 make -j8
 make install
 cd ..
-
+```
 #### 2.3 install nginx
+```bash
 cd nginx-1.8.0
 ./configure --prefix=/usr/local/nginx \
 --user=www \
@@ -81,6 +90,7 @@ cd nginx-1.8.0
 
 make -j8
 make install
+```