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<h1 id="centos-常用配置及命令">Centos 常用配置及命令</h1>
<blockquote>
<p>让命令行提示符显式完整路径</p>
</blockquote>
<p>1.编辑/etc/profile文件，添加环境变量PS1</p>
<pre><code>export PS1='[\u@\h `pwd`]\$'
</code></pre><p>2.使环境变量生效</p>
<p><code>source /etc/profile</code></p>
<blockquote>
<p>防火墙相关 Centos7</p>
</blockquote>
<pre><code>sudo systemctl enable firewalld.service //"开机启动"启用
sudo systemctl disable firewalld.service //"开机自启"禁用
sudo systemctl start firewalld.service //启动防火墙
sudo systemctl stop firewalld.service //停止防火墙
sudo systemctl status firewalld.service //查看防火墙状态
firewall-cmd --state //查看防火墙状态
</code></pre><blockquote>
<p>查找端口号</p>
</blockquote>
<pre><code>netstat -ano | grep 50070
</code></pre><blockquote>
<p>查看可以登录系统的用户</p>
</blockquote>
<pre><code>cat /etc/passwd | grep -v /sbin/nologin | cut -d : -f 1
</code></pre><blockquote>
<p>权限对应的数值</p>
</blockquote>
<pre><code>r(读权限)：4
w(写权限): 2
x(执行权限）:1
</code></pre><blockquote>
<p>linux中文件或者文件夹的权限从左右到右依次为所有者权限、所有者所在组的权限、其它用户权限。</p>
</blockquote>
<pre><code>d:表示文件类型，代表文件类型为目录
rw-:表示所有者的权限为读权限和写权限，即4+2=6
r--:表示所有者所在的用户组权限为只读权限，即4
r--:表示其它用户的权限为只读权限，即4
综合而来，rw-r--r--的权限用数字表示为644。
</code></pre>
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