linux

查看是否安装ruby

rpm -qa | grep ruby

yum list installed | grep ruby

查看安装到哪儿了

whereis mysql

查询运行文件所在路径

which mysql

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从最新版本的linux系统开始，默认的是 Mariadb而不是MySQL！

使用系统自带的repos安装很简单：

yum install mariadb mariadb-server

systemctl start mariadb ==> 启动mariadb

systemctl enable mariadb ==> 开机自启动

mysql_secure_installation ==> 设置 root密码等相关

mysql -uroot -p123456 ==> 测试登录！

结束！

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 systemctl restart mariadb.service

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 xz -d 要解压的文件

xz -d node-v6.9.4-linux-x64.tar.xz

tar xvf xxx.tar来解包

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CentOS7安装NodeJS6.9

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yum install epel-release

yum install nodejs

yum install mongodb-server

yum install mongodb

yum install redis

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nodejs

yum install npm                 安装 包管理    卸载 包管理          sudo npm uninstall npm -g

npm config set strict-ssl false              取消ssl严格认证

npm install -g cnpm                           安装cnpm

npm install -g cnpm --registry=https://registry.npm.taobao.org/                       报错bash: cnpm: command not found...