linux 闲谈杂记1（查看，修改 用户所属的群组、设置linux的环境变量、ubuntu15.04更换源）
@查看用户所属的群组：[groups -username]
修改用户所属的用户组：[usermod ]
@通过文件设置linux环境变量（原文）
- /etc/profile: 此文件为系统的每个用户设置环境信息。
- /etc/bashrc: 当 bash shell 被打开时，该文件被读取。也就是说，每次新打开一个终端 shell，该文件就会被读取。
接着是与上述两个文件对应，但只对单个用户生效：
- ~/.bash_profile 或 ~/.profile: 只对单个用户生效，当用户登录时该文件仅执行一次。在不同的LINUX操作系统下，这个文件可能是不同的。
- ~/.bashrc: 只对单个用户生效，当登录以及每次打开新的 shell 时，该文件被读取。
- /etc/environment 设置的也是全局变量，从文件本身的作用上来说， /etc/environment 设置的是整个系统的环境，而/etc/profile是设置所有用户的环境
注意：
1）/etc/environment 中不能包含命令，即直接通过 VAR="..." 的方式设置，不使用 export
2）
使用
source /etc/environment
可以使变量设置在当前窗口立即生效，只有需注销/重启之后，才能对每个新终端窗口都生效。
@Ubuntu15.04 更换源
源：
## 搜狐源： deb http://mirrors.sohu.com/ubuntu/ vivid main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ vivid-security main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ vivid-updates main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ vivid-proposed main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ vivid-backports main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ vivid main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ vivid-security main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ vivid-updates main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ vivid-proposed main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ vivid-backports main restricted universe multiverse ## 阿里云源： deb http://mirrors.aliyun.com/ubuntu/ vivid main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ vivid-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ vivid-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ vivid-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ vivid-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ vivid main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ vivid-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ vivid-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ vivid-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ vivid-backports main restricted universe multiverse ## 网易源： deb http://mirrors.163.com/ubuntu/ vivid main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ vivid-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ vivid-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ vivid-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ vivid-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ vivid main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ vivid-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ vivid-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ vivid-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ vivid-backports main restricted universe multiverse
三，直接修改源的方法： 在终端中执行下面命令备份源： sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak 运行下面命令修改： sudo gedit /etc/apt/sources.list 删除里面所有的内容，增加下面的Ubuntu 15.10源： deb http://mirrors.hust.edu.cn/ubuntu/ wily main restricted universe multiverse deb http://mirrors.hust.edu.cn/ubuntu/ wily-security main restricted universe multiverse deb http://mirrors.hust.edu.cn/ubuntu/ wily-updates main restricted universe multiverse deb http://mirrors.hust.edu.cn/ubuntu/ wily-proposed main restricted universe multiverse deb http://mirrors.hust.edu.cn/ubuntu/ wily-backports main restricted universe multiverse deb-src http://mirrors.hust.edu.cn/ubuntu/ wily main restricted universe multiverse deb-src http://mirrors.hust.edu.cn/ubuntu/ wily-security main restricted universe multiverse deb-src http://mirrors.hust.edu.cn/ubuntu/ wily-updates main restricted universe multiverse deb-src http://mirrors.hust.edu.cn/ubuntu/ wily-proposed main restricted universe multiverse deb-src http://mirrors.hust.edu.cn/ubuntu/ wily-backports main restricted universe multiverse
方法：
1.打开/etc/apt/sources.list
sudo gedit /etc/apt/sources.list
2.将上面的 源 复制进去
3.Ctrl + S 保存（因为我用gedit文本编译器）
4 执行[ sudo apt-get update ]命令
ubuntu 安装vbox
1、
sudo gedit /etc/apt/sources.list
## add by peerslee at 20160121
## for installing Virtualbox
deb http://download.virtualbox.org/virtualbox/debian vivid contrib
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
sudo apt-get update
sudo apt-get install virtualbox-5.0
2、
Oracle_VM_VirtualBox_Extension_Pack-5.0.2-102096.vbox-extpack
扩展
linux 安装锐捷客户端
chmod +x ./program/rjsupplicant/rjsupplicant.sh
sudo ./program/rjsupplicant/rjsupplicant.sh -u 你的网号 -p 你的网号密码 &
sudo ./program/rjsupplicant/rjsupplicant.sh -d 1
sudo ./program/rjsupplicant/rjsupplicant.sh --help