install nginx with ngx_lua automatically under debian/ubuntu like system

install.sh

#!/bin/bash
set -e
NGX_VER="1.8.0"
NDK_VER="0.2.19"
NGX_LUA_VER="0.9.16"
LUAJIT_VER="2.0.4"
LUAROCKS_VER="2.2.1"
WORKDIR=$(pwd)
NGX_INSTALL_DIR="/usr/local/nginx"
if ! [ -e "nginx-${NGX_VER}.tar.gz" ]; then
	wget http://nginx.org/download/nginx-${NGX_VER}.tar.gz
fi

if ! [ -e "v${NDK_VER}.tar.gz" ]; then
	wget https://github.com/simpl/ngx_devel_kit/archive/v${NDK_VER}.tar.gz
fi
if ! [ -e "v${NGX_LUA_VER}.tar.gz" ]; then
	wget https://github.com/openresty/lua-nginx-module/archive/v${NGX_LUA_VER}.tar.gz
fi
if ! [ -e "LuaJIT-${LUAJIT_VER}.tar.gz" ]; then
	wget http://luajit.org/download/LuaJIT-${LUAJIT_VER}.tar.gz
fi
if ! [ -e "luarocks-${LUAROCKS_VER}.tar.gz" ]; then
	wget http://luarocks.org/releases/luarocks-2.2.1.tar.gz
fi

install_luarocks() {
	cd $WORKDIR
	tar zxpf luarocks-${LUAROCKS_VER}.tar.gz
	cd luarocks-${LUAROCKS_VER}
	./configure --lua-suffix=jit --with-lua-include=/usr/local/include/luajit-2.0
	sudo make bootstrap
}

extract_ndk() {
	if ! [ -d ${WORKDIR}/ngx_devel_kit-${NDK_VER} ]; then
		tar zxf v${NDK_VER}.tar.gz
	fi
}

extract_lua_ngx() {
	if ! [ -d ${WORKDIR}/lua-nginx-module-${NGX_LUA_VER} ]; then
		tar zxf v${NGX_LUA_VER}.tar.gz
	fi
}

install_luajit() {
	cd $WORKDIR
	tar zxf LuaJIT-${LUAJIT_VER}.tar.gz
	cd LuaJIT-${LUAJIT_VER}
	make
	sudo make install
}
extract_nginx() {
	if ! [ -d "$WORKDIR/nginx-${NGX_VER}" ]; then
		tar zxf nginx-${NGX_VER}.tar.gz
	fi
}

install_nginx() {
	cd "$WORKDIR/nginx-${NGX_VER}"
	export LUAJIT_LIB=/usr/local/lib
	export LUAJIT_INC=/usr/local/include/luajit-2.0
	./configure --prefix=${NGX_INSTALL_DIR} --with-ld-opt='-Wl,-rpath,/usr/local/lib' --add-module=${WORKDIR}/ngx_devel_kit-${NDK_VER} --add-module=${WORKDIR}/lua-nginx-module-${NGX_LUA_VER}
	make -j2
	sudo make install
	sudo ln -sf /usr/local/nginx/sbin/nginx /usr/local/bin
}
sudo apt-get update
sudo apt-get install -yy build-essential make libpcre3-dev zlibc zlib1g-dev
extract_ndk
extract_nginx
extract_lua_ngx
if [ -z `command -v luajit` ]; then
	install_luajit
fi
if [ -z `command -v nginx`]; then
	install_nginx
fi
if [ -z `command -v luarocks` ]; then
	install_luarocks
fi

I think last line on install_nginx() have to be sudo ln -sf ${NGX_INSTALL_DIR}/sbin/nginx /usr/local/bin

It's true?