Linux Redhat Basic Operations 3

ID # # #查看用户信息

Id-u # # #查看用户uid

-G # # #查看用户所在组id

-A # # View all user information

-G # # #查看用户所在所有组id (including all history groups)

-un # # #查看用户名字

-GN # # #查看用户初始组名称

-GN # # #查看用户所有组名称

su-username## #加杠会改变用户的环境, not only changed the user name, but also changed the user bash environment

Echo $PATH # #查看当前用户的用户环境

Echo $USER # #查看当前用户信息

Cat/etc/group # #查看组信息

/etc/passwd# #查看用户所有信息, including home directory information

/etc/shadow# #查看用户家目录名称

/etc/shalls # #查看系统的所有shell, plus s

/sbin/nologin# #表示此用户的shell是非交互

/bin/bash # #表示此用户的shell是交互的

Useradd-u uid-g GID Username # #新增用户, to specify the UID of the user, specify the user initial group ID

-d/mnt/test test# #改变用户家目录信息

# #新建用户uid默认是从1001开始, according to the file/etc/login.defs.

Userdel-r username# #删除用户

Usermod-u # #改变用户uid

The name changed after the name of-L was renamed # #改变用户名字

-G uid username# #改变用户初始组

-G GID username# #改变用户附加组

-ag GID username# #增加用户附加组

-D # #改变用户家目录信息

-MD # #改变用户家目录信息和家目录名称

-S # #改变用户的shell

-C # #改变用户的说明

-L # #冻结 (locked) user, this user cannot log on, but the root user can manage this user

-U # #解锁用户

Groupadd-g GID groupname# #增加组信息

Groupdel GroupName # #删除组

Visudo # #查看和编辑权限信息, Root gives permissions to ordinary users

The edited content is the/etc/sudoers file

User name + hostname + "" (root) + NOPASSWD permissions

Test desktop0.example.com = (root) nopasswd:/usr/sbin/useradd,/usr/sbin/userdel

Normal User Run

sudo useradd test2

sudo userdel test2

Add sudo to the front to indicate the use rights

Watch-n 3 ' tail-3/etc/shadow '

/etc/shadow # # #查看用户密码信息

CHAGE-M Username # #改变密码最短有效期

-M username # #改变密码最长有效期

-W 7 username # #改变密码警告期

-I 3 username # #改变密码非活跃期

-e 2016-10-27 Username # #改变密码还有多长时间到期

Modifky MoD

PTS Output Save File

L Link

Ls-l Viewing file properties

1. The number of times the file contents are recorded by the system

-Documents

Catalog D

r# #对于目录是可以可见, for file is can see

w# #对于目录是删除, can be written and modified for files

x# #对于目录是可以 for files that can be executed

6 file property size, the larger the file the larger the property

chown username FileName # #改变文件属性权限为username

Chown Username.groupname Path-R # #第归改变此目录下所有文件权限为所有者为username组名为root

CHGRP groupname filename Change file attribute group to GroupName

chmod O+wx/mnt/test1 # #改变test1文件其他用户权限为可写可执行

chmod U+rwx/mnt/test1 # #改变test1文件所有者权限为

"Id-gn" = "Id-un" # #用户初始组id和用户id相同的情况

Cat/etc/group # #查看组信息

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Linux Redhat Basic Operations 3