Manage users on Ubuntu

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$ more /etc/passwd
root:x:0:0:root:/root:/bin/bash
fan:x:1000:1000:,,,:/home/fan:/bin/bash

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例如：fan:x:1000:1000:,,,:/home/fan:/bin/bash
fan　　	//用户名 
x　　	//口令、密码 
1000　　	//用户id（0代表root、普通新建用户从500开始）
1000　　	//所在组 
,,,　　	//描述 
/home/fan　　	//用户主目录 
/bin/bash　　	//用户缺省Shell

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# add a new user
$ sudo adduser gfw
Adding user `gfw' ...
Adding new group `gfw' (1001) ...
Adding new user `gfw' (1001) with group `gfw' ...
Creating home directory `/home/gfw' ...
Copying files from `/etc/skel' ...
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully
Changing the user information for gfw
Enter the new value, or press ENTER for the default
	Full Name []: gfw
	Room Number []: 
	Work Phone []: 
	Home Phone []: 
	Other []: proxy
Is the information correct? [Y/n] y

# login as the new account
$ su - gfw
Password: 
gfw@iZu1lw5glrvZ:~$ 

# change password for the new account
$ passwd gfw
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully