ubuntu下nginx源码安装问题?报错

想在ubuntu12.04下安装 nginx1.52，找到一篇教程：http://cmzx3444.iteye.com/blog/1594709 按照其中的步骤进行安装，最后执行 /etc/init.d/nginx start 时报错：“

/etc/init.d/nginx: 第 17 行: [: =: 期待一元表达式

Starting nginx: 

”

/etc/init.d/nginx 中的内容为：

# start 

#!/bin/bash
# nginx Startup script for the Nginx HTTP Server
# it is v.0.0.2 version.
# chkconfig: - 85 15
# description: Nginx is a high-performance web and proxy server.
#              It has a lot of features, but it's not for everyone.
# processname: nginx
# pidfile: /var/run/nginx.pid
# config: /usr/local/nginx/conf/nginx.conf
nginxd=/usr/local/nginx/sbin/nginx
nginx_config=/usr/local/nginx/conf/nginx.conf
nginx_pid=/var/run/nginx.pid
RETVAL=0
prog="nginx"


# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0
[ -x $nginxd ] || exit 0
# Start nginx daemons functions.
start() {
if [ -e $nginx_pid ];then
   echo "nginx already running...."
   exit 1
fi
   echo -n $"Starting $prog: "
   $nginxd -c ${nginx_config}
   RETVAL=$?
   echo
   [ $RETVAL = 0 ]
   return $RETVAL
}
# Stop nginx daemons functions.
stop() {
        echo -n $"Stopping $prog: "
        $nginxd -s stop
        RETVAL=$?
        echo
        [ $RETVAL = 0 ]
}
# reload nginx service functions.
reload() {
    echo -n $"Reloading $prog: "
    #kill -HUP `cat ${nginx_pid}`
    killproc $nginxd -HUP
    RETVAL=$?
    echo
}
# See how we were called.
case "$1" in
start)
        start
        ;;
stop)
        stop
        ;;
reload)
        reload
        ;;
restart)
        stop
        start
        ;;
status)
        status $prog
        RETVAL=$?
        ;;
*)
        echo $"Usage: $prog {start|stop}"
        exit 1
esac
exit $RETVAL

# end

访问 localhost 时却能打开nginx默认主页，

想问下，我这个nginx算安装好了吗》？按我这个步骤安装好的nginx怎样修改其他配置（如：默认端口等）

详情各位拍砖指点。。。