命令linux用户管理命令(添加,删除,修改)(Linux user management commands (add, delete, modify))

linux删除命令  时间:2021-02-27  阅读:()

linux用户管理命令(添加,删除,修改) Linux user managementcommands (add, del et e, modi fy) 

Linux forced landing users kicked off

View users landing in machines

[root@sunsyk w~]#

16:29:02 up 2 days, 2:35, 5 users, load average: 0.03, 0.05,

0.01

USER, TTY, FROM, LOGIN@, IDLE, JCPU, PCPU, WHAT

Root pts/1 : 0, Tue15, 2days, 1:44, 0.04s, -bash

Root pts/2: 0, Tue15, 46:42m, 0.05s, 0.05s, Bash

Root pts/3: 0, Tue15, 2days, 0.02s, 0.02s, Bash

Root, pts/4, 172.20.52. 114, 14: 17, 58:48, 0. 16s, 0.03s,sqlplus

Root, pts/5, 172.20.52. 114, 15:31, 0.00s, 0.03s, 0.00s, wI put the pts/1 out (only root to kick off the user)[root@sunsyk pkill -kill -t pts/1 ~]#

[root@sunsyk pkill -kill -t pts/2 ~]#

[root@sunsyk pkill -kill -t pts/3 ~]#

See is not kicked off

[root@sunsyk w~]#

16:34:16 up 2 days, 2:40, 2 users, load average: 0, 0.05, 0.02USER, TTY, FROM, LOGIN@, IDLE, JCPU, PCPU, WHAT

Root, pts/4, 172.20.52. 114, 14: 17, 1 :04m, 0. 16s, 0.03s,sqlplus

Root, pts/5, 172.20.52. 114, 15:31, 0.00s, 0.03s, 0.00s, wLog in as the login command:

During the user login system, you can also change the identitywith the "login" command and even log on to other hosts inaddition to the "Su-" command. If you use the "login" commandto change the identity, as long as the input will change theusername directly in the command: [root@ns1 root]# loginCaroline - > change user name is Caroline, if you want to logon the other host, need to use the "-h"parameter to the "login"command: [root@ns1 root]# login-h linux2 - >Linux2 login forthe host.

Log in as the rlogin command:

Inaddition to using the login command, rlogin can alsobe usedto log on to remote hosts, and its usage is simple. Here is an

example of a connection to linux2. jschouse.com:

[root@ns1 root]# rlogin linux2. jschouse.com - >linux2. jschouse. com login

Password: is in the same name - > * login default, so there isno "login" informat ion

Login incorrect- > if the name used to login with the username,can directly press the "Enter", and ignore the errori nformat ion

Login: Jack - > to enter a different username

Password: * - > password

The use of /etc/nologin files:

If you want to only root can log on the host, other account cannot log in, you can add a file named "nologin" in the /etcdirectory in the file, as long as the random input characterscan be found in the file system as long as there will preventother users login.

System logout:

The front is introduced to change the identity in the "login"command, and can log on the other host, and login relative tothe command "logout", it can make the currently logged on userlog off the system, so that other users login. The use of thiscommand is simple. You can log on to the system as long as you

enter "logout": [root@ns1 root]# logout

As described earlier, the Linux system is a multi-useroperating system, and each user' s access to the system needsto be set by the system administrator. This section describessome of the commands that the system administrator manages forusers and user groups.

4.6. 1 creates new users

The useradd command (also using addUser) is used to create anew user account with the following commands:

Table 4 - 19 useradd command common options

Common phenomenon

Significance

-d

Sets the landing directory for new users

-e

Set the new user' s stop date, the date format is MM/DD/YY-f

A few days after the account has expired permanent suspension.The value is 0 when the account is immediately stopped. When

duty is -1, this function is turned off. The default value is-1

-g

Enable new users to join groups

-G

Add new users to a new group. Each group is separated by commas,which must not be enclosed in blank words

-s

Specifies the login Shell for the new user

-u

Sets the ID value for new users

When a new user is created successfully, a line of informationabout that user is added to the /etc/passwd file, formatted asfollows:

[user name: [password] : [UID] : [GID] : [identity description] :[home directory] [landing Shell]

One of the fields is divided into 7 parts by the colon ":".Because less than 500 of the UID and GID are generally the systemitself retained, do not do ordinary users and groups of signs,

so the new increase in users and groups are generally UID andGID greater than 500.

For example, use the following command:

Root@localhost root useradd user1 #

A user named userl will be created, and the user managementcommand has been introduced, and no more is introduced here.The result of executing the useradd command is shown in figure11-13.

4.6.2 sets and modifies user password passwd

The passwd command is used to set and modify user commands. Onlysuper users and users can change their passwords themselves,and other ordinary users do not have the right to modify otheruser passwords. Its order is as follows:

# passwd username.

To avoid entering passwords, it is noticed howmany bits, Linuxdoes not use a password like Windows echo [shown as *] , so theinput of these characters is invisible. For example, to setpasswords for new userl users, use the following command:Root@localhost root passwd user1 #

According to the system prompted information, enter thepassword two times, the system will display:

Passwd: : all, authentication, tokens, updated, successfullyIndicates that the change password succeeded. The new user' sjob is completed only after the user has set the password,otherwise the user name cannot be used to log on.

4.6. 3 modify user information usermod

The usermod command is used to modify user information, and itscommand format is as follows:

# usermod option: user name.

The common command option, 11-20, is shown.

Table 4-20 common options for usermod commands

Common options

Significance

-d

Update the user' s new login directory

-e

Set the new user' s stop date, the date format is MM/DD/YY-f

A few days after the account has expired permanent suspension.The value is 0 when the account is immediately stopped. Whenduty is -1, this function is turned off. The default value is-1

-g

Update user new user to join group

-G

Define the user as a group of groups members. Each group uses"?"" Separate from blank words

-l

To change the name of the user login, the user at the same timethe directory name will follow the change into a new name-s

Specify a new user Shell

-u

The user ID value must be the unique ID value. The user directorytree document directory the userID will automatically changeon the support directory document is to manually changeFor example, the following command modif ies user information:

Root@localhost root usermod- d/home/user2 s/bin/bash user2 -#

Set the home directory path for user name user2 at/home/user1,and the Shell setting for login to /usr/bin/gcc.

In general, the usermod command modifies user accountinformation with reference to the commands section. However,usermod does not allow changing the user account name on theline, so when using usermod to change user account information,You must verify that this name has not been executed on thec omputer.

4.6.4 new group groupadd

The groupadd command is used to create a new group of users,and the commands are as follows:

# groupadd options: user name.

Common options are:

-g:GID value. Unless the -o parameter is used, the value mustbe unique, not the same, and the value must not be negative.The GID value is preset to be minimum, not less than 500 andincreased sequentially. 0 - 499 is traditionally reserved forsystem account usage.

TTcloud(月$70)E3-1270V3 8GB内存 10Mbps带宽 ,日本独立服务器

关于TTCLOUD服务商在今年初的时候有介绍过一次,而且对于他们家的美国圣何塞服务器有过简单的测评,这个服务商主要是提供独立服务器业务的。目前托管硬件已经达到5000台服务器或节点,主要经营圣何塞,洛杉矶以及日本东京三个地区的数据中心业务。这次看到商家有推出了新上架的日本独立服务器促销活动,价格 $70/月起,季付送10Mbps带宽。也可以跟进客户的需求进行各种DIY定制。内存CPU硬盘流量带宽价...

BuyVM迈阿密KVM上线,AMD Ryzen 3900X+NVMe硬盘$2/月起

BuyVM在昨天宣布上线了第四个数据中心产品:迈阿密,基于KVM架构的VPS主机,采用AMD Ryzen 3900X CPU,DDR4内存,NVMe硬盘,1Gbps带宽,不限制流量方式,最低$2/月起,支持Linux或者Windows操作系统。这是一家成立于2010年的国外主机商,提供基于KVM架构的VPS产品,数据中心除了新上的迈阿密外还包括美国拉斯维加斯、新泽西和卢森堡等,主机均为1Gbps带...

Sparkedhost($8/月)美国迈阿密AMD Ryzen高性能VPS;免费100G高防

sparkedhost怎么样?sparkedhost主机。Sparkedhost于2017年7月注册在美国康涅狄格州,2018年收购了ClynexHost,2019年8月从Taltum Solutions SL收购了The Beast Hosting,同年10月从Reilly Bauer收购了OptNode Hosting。sparkedhost当前的业务主要为:为游戏“我的世界”提供服务器、虚拟...

linux删除命令为你推荐
怎么样免费装扮qq空间要怎么免费装扮QQ空间!邮箱打不开怎么办我的邮箱打不开怎么办快速美白好方法有什么变白的好方法数码资源网哪个网站可以直接在线做照片?功能要齐全的`云挂机云软件挂机赚钱是骗子电子商务网站模板电子商务网站模板哪个好?电子商务网站模板免费建站怎么样?网络虚拟机虚拟机网络设置声母是什么22个声母是什么微信怎么看聊天记录怎样查找一个人的微信聊天记录网站地图制作我想给网站做网站地图不知道怎么做的,请教高手!
域名服务器 联通vps 已备案域名出售 过期域名抢注 韩国电信 密码泄露 国外空间 建站代码 湖南服务器托管 美国十次啦服务器 jsp空间 789电视网 服务器托管什么意思 美国免费空间 hdd 免费的域名 中国联通宽带测速 阿里dns 云服务是什么意思 广州主机托管 更多