shell语句编写nginx的启动脚本

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　　nginx的启动脚本
　　问题：在预编译安装nginx时候每次启动时都非常不方便，所以想了下写个nginx脚本在/etc/init.d目录下可实现service的方式启动、停止、重启这样就方便多了！
　　[root@cml init.d]# vim nginxd
　　#!/bin/bash
　　#chkconfig: 2345 20 80
　　prog="nginxd"
　　nginx_bin="/usr/local/nginx/sbin/nginx"
　　if [ -x $nginx_bin ]; then   ##if语句判断是否存在nginx路径
　　echo  "$nginx_bin is installled !"
　　else
　　echo -n "$nginx_bin not installed !"
　　exit 5
　　fi
　　start(){
　　echo -n "starting $prog:"
　　$nginx_bin -t          ##测试nginx配置文件
　　a=$?
　　if [ $a -eq 0 ]; then    ###if语句判断上一句是否执行成功
　　touch /tmp/nginx.pid        ##创建一个nginx.pid文件后启动nginx
　　$nginx_bin
　　else
　　echo "please check your nginx config"
　　exit 10
　　fi
　　}
　　stop(){
　　echo -n $"stopping $prog:"
　　$nginx_bin -s stop            ##停止nginx
　　a=$?
　　if [ $a -eq 0 ]; then          ##判断执行上一句成功就删除nginx.pid文件输出信息
　　rm -rf /tmp/nginx.pid
　　echo "success stop nginx"
　　else
　　echo "check your nginx command"
　　exit 11
　　fi
　　}
　　case $1 in  ##
　　start)
　　start
　　;;
　　stop)
　　stop
　　;;

　　>　　stop
　　sleep 2
　　start
　　;;
　　*)
　　echo "Usage:$0{start|stop|reload/restart}"
　　;;
　　esac
　　验证：
　　[root@cml init.d]# service nginxd start
　　/usr/local/nginx/sbin/nginx is installled !
　　starting nginxd:nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
　　nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
　　nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
　　nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
　　nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
　　nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
　　nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
　　nginx: [emerg] still could not bind()
　　[root@cml init.d]# service nginxd stop
　　/usr/local/nginx/sbin/nginx is installled !
　　stopping nginxd:success stop nginx
　　[root@cml init.d]# service nginxd start
　　/usr/local/nginx/sbin/nginx is installled !
　　starting nginxd:nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
　　nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
　　[root@cml init.d]# service nginxd restart
　　/usr/local/nginx/sbin/nginx is installled !
　　stopping nginxd:success stop nginx
　　starting nginxd:nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
　　nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful