## 从视频中提取音频

sudo apt-get install mencoder

mencoder 视频名称 -of rawaudio -oac lavc -ovc frameno -o 输出音频.mp3


## Linux使用过程中问题的解决方案

### 1. 使用Chrome/Chromium浏览器避免输入密码的解决方法

Mint/Ubuntu 终端输入seahorse 得到:

## Solution for the Error “*** is not in the sudoers file. This incident will be reported. “

On the Raspbian system, when I created a new user with the commands
#useradd gang
There is no directory named "gang" under the home directory. When I login as a user (gang) and want to use the sudo command to create a main directory for myself, I saw the error "gang is not in the sudoers file. This incident will be reported. " This error implies that I have to edit the sudoers file to give myself the privilege to use sudo. To have the root privilege, I need to do as follows.