Linux Learning Notes (4)

User Group Management:

1. groupadd User group name

eg, gruopadd grp1 #创建用户组grp1

2. Gruopdel user group name

eg, groupdel grp1 #删除用户组grp1

User management:

1. useradd [option] User name

eg, useradd usr1 #创建用户usr1;

Useradd-u 322-g grp1-g grp2 usr1 #建立用户usr1, the UID is 322, the main user group is GRP1, and the additional user group is GRP2;

2, passwd user name #建立用户的登录密码;

3, userdel user name #删除用户;

4. usermod [option] User name #修改用户属性

eg, usermod-g grp2 usr1 #将用户usr1的主用户组更改为grp2; '

5, chown [user]:[User Group] file list #改变文件的所属用户和组

eg, chown usr1 myfile #设置文件myfile所属用户为usr1

Chown:gep1 myfile #设置文件myfile所属用户组为grp1

Chown usr1:grp1 myfile #设置文件myfile所属用户和用户组分别为usr1和grp1

6, chmod

eg, chmod a=--x demon #所有用户对demon都有执行权限

chmod u+r--Demon #属主用户 (own user) has read access to Demon

chmod G=-w-demon #属主用户组 (all other users in the group) have write access to demon

chmod o=rwx Demon #所有其他用户对demon有读写执行权限

chmod 666 Demon #属主用户 (Own) Read and write to demon, other users in the group have read and write to demon, other users have read and write access to demon

"+" add permission;

"-" Delete permission;

"=" Assignment permission;

Linux Learning Notes (4)