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<h1>mac os x查看端口占用</h1>
<ol>
<li>查找指定端口号
<code>bash
netstat -nat | grep 3000
</code></li>
</ol>
<p>2.查找所有端口占用</p>
<pre><code class="language-bash">lsof -n -P -i TCP -s TCP:LISTEN
</code></pre>
<p>3.使用telnet</p>
<pre><code class="language-bash">/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" #安装brew
brew install telnet #安装telnet
#检查本机的3306端口是否打开， 如下
telnet 127.0.0.1 3306
#若该端口没有打开，则会自动退出，并显示如下内容：
#Trying 127.0.0.1...
#telnet: connect to address 127.0.0.1: Connection refused
#telnet: Unable to connect to remote host
</code></pre>
<p>4.使用nc</p>
<pre><code class="language-bash">#-w 10 表示等待连接时间为10秒
#-n 尽量将端口号名称转换为端口号数字
#-z 对需要检查的端口没有输入输出，用于端口扫描模式
#127.0.0.1 需要检查的ip地址
#1990-1999 可以是一个端口，也可以是一段端口
#返回结果为开放的端口， 如本例中的 1997 和 1998 端口
nc -w 2 -n -z 127.0.0.1 1990-9000
Connection to 127.0.0.1 port 3000 [tcp/*] succeeded!
Connection to 127.0.0.1 port 3306 [tcp/*] succeeded!
</code></pre>
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