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yum install -y python-openstackclient openstack-selinuxyum install -y mariadb mariadb-server python2-pythonsystemctl enable mariadbmysql_secure_installation 初始化数据库 y,n,y,ymysql -uroot -p000000登录数据库，以6个0为密码登录============忘记密码先停止再修改mysql密码==============

-------------sed-------------------sed -i -e '7s/^/server controller iburst/g' -e '27s/^/allow 10.32.24.0\/23/g' -e '31s/^/local stratum 10/g' /etc/chrony.conf-i -e  输入，多行匹配，同时将多个地方进行输入7s 第7行/^ 开头/server controller iburst/g 插入的信息-----------------cat-

yum list >/dev/null将yum list的信息输出到黑洞：/dev/null    什么也没有---------------------------------------- yum search xxxx >>/dev/null 2>&11为标准。2为错误。2>&1  将1和2都输出到黑洞------------------------------------------------

#!/bin/basha=3if [ $a -gt 3 ]thenecho "a大于3"fi----------------gt 大于then 返回echo 打印fi 循环结束eq相等 ne、neq不相等， gt大于， lt小于 gte、ge大于等于 lte、le 小于等于 not非 mod求模 is [not] div by是否能被某数整除 is [not] even是否为偶数 is [not] even by $b即($a / $b) % 2 == 0 is [not] odd是否为奇 is not

颜色资源在res/values/colors.xml文件中<resources>    <color name="black">#000000</color>   //黑色，调用名称为：black    <color name="white">#FFFFFF</color> //白色，调用名称为：white</resources>-----------------------

// JavaScript Documentvar scores=new Array();document.write("<br/>scores.length:"+scores.length);//scores[0]=100;document.write("<br/>scores.length:"+scores.length);var info=new Array("zs","boy",190.5,9);//定义数组初始化document.write("<br/>inf

// JavaScript Documentfunction loop(){ var sword=""; while(sword!="000000") { sword=prompt("请输入你的密码:",sword); } alert("欢迎你！")；}//loopy();function add(x,y){ return x+y; }var result=add(3,6);document.write("<br/>"+result);function addPro(){ var n=arg

#!/bin/bash# date:2019-03-19#Author:GuoRia=`ifconfig |grep -w inet|awk 'NR==1{print$2}'`b=hostnameecho "$a $b" >> /etc/hosts--------------------赛选出本机IP------------ifconfig |grep -w inet|awk 'NR==1{print$2}'赛选出本机IPifconfig |grep -w inet完全匹配inet的信息|aw

--------------在原视图转跳到新视图-----------------------------@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button button=(Button) findViewById(R.id.button); bu

//99乘法表document.write("<table border=1>");for(i=1;i<10;i++){ document.write("<tr>"); for(j=1;j<10;j++) { document.write("<td>"+i+"*"+j+"="+(i*j)+"</td>"); } document.write("</tr>");}document.write("</table>");