Linux Rights Management

User Management

Useradd Creating a user

Options:

-U UID

-G GID

-D Home Directory, the average user has the highest permissions in the home directory, by default in the operating system's//directory.

-S login after user-enabled shell, graphical interface and command line.

[Email protected] zyj]# Useradd SL//default Create home directory and group ID, username ID and login Shell[[Email protected] zyj]# CD/Home[[email protected] home]#lshello.txt SL x zyj[[email protected] sl]# more/etc/passwdroot:x:0:0: root:/root:/bin/bashbin:x:1:1: bin:/bin:/sbin/nologindaemon:x:2:2:d aemon:/sbin:/sbin/nologinadm:x:3:4: adm:/var/adm:/sbin/nologinsl:x: 501:501::/home/sl:/bin/bash

Userdel: Deleting users

 more/etc/passwdroot:x:0:0: root:/root:/bin/bashbin:x:  1:1: bin:/bin:/sbin/nologindaemon:x:2:2:d aemon:/sbin:/sbin/  NOLOGINADM:X:3:4: adm:/var/adm:/sbin/nologinzyj:x:  £ python_full:/home/zyj:/bin/bash

passwd: Set a password for all users and re-execute the equivalent of a password change.

passwd  // change the root password directly without adding users  for  passwd// Modify password for user Zyj for 

[email protected] ~]# echo "123123" | passwd-- stdin Zyj  //Set the password for user Zyj once   . passwd: All authentication tokens updated successfully.

Usermod: Modify user account properties

-U UID System assigns 500 user ID to user id,root after 0

-G GID

-C

-d,-m

-S

-L

-L: Lock account

-U: Unlock Account

Chsh: Modify the user's default shell, set the user cannot log in, need to use this command. Modify/bin/bash to/sbin/nologin

[email protected] home]# chsh sl changing Shell forSL. New Shell [ /bin/bash]:/sbin/ nologinShell changed. [Email protected] home]# [[email protected] home]# More/etc/passwdroot:x:0:0: root:/root:/bin/bashtcpdump:x: the: the::/:/sbin/nologinzyj:x: -: -: python_full:/home/zyj:/bin/bashsl:x:501:501::/home/sl:/sbin/Nologin[[email protected] home]#

Finger: View user account information

CHFN: Modifying annotation information

 for 1231231222222

ID: View User ID information

ID zyjuid=zyj gid=Groups=ID  sluid =501(SL) gid=501Groups=501(SL)

Chage: Modify the user password information, the user password default period of 99,999 days.

-D: Last modification time

-E: Expiration time

-L: Inactivity time

-M: Minimum period of use

-M: Maximum lifespan

-W: Warning time

[Email protected] home]# More /etc/ Shadow //view password default parameter root:$1$swlT 1$4HBBALVXQX4TE2W3SR9WW1:17635:0:99999:7::: Bin:*:17246:0:99999:7: ::d Aemon:*:17246:0:99999:7::: adm:*:17246:0:99999:7:::LP:*:17246:0:99999:7:::Sync:*:17246:0:99999:7:: : Shutdown:*:17246:0:99999:7:: : Halt:*:17246:0:99999:7:: : Mail:*:17246:0:99999:7:: : UUCP:*:17246:0:99999:7:: : operator:*:17246:0:99999:7:: : Games:*:17246:0:99999:7:: : Gopher:*:17246:0:99999:7:::FTP:*:17246:0:99999:7:: : Nobody:*:17246:0:99999:7: ::d bus:!!:17635::::: : usbmuxd:!!:17635::::: : Rtkit:!!:17635::::: : Avahi-autoipd:!!:17635::::: : VCSA:!!:17635::::: : ABRT:!!:17635::::: : Haldaemon:!!:17635::::: : NTP:!!:17635::::: : Apache:!!:17635::::: : Saslauth:!!:17635:::: ::p ostfix:!!:17635::::: : GDM:!!:17635:::: ::p ulse:!!:17635::::: : sshd:!!:17635::::: : tcpdump:!!:17635::::: : zyj:$1$B 9mfalrm$atlvuiseu92vf9uibg11z.:17646:0:99999:7:: : SL:!!:17646:0:99999:7:::

Group Management

Groupadd

Groupdel

Groupmod

gpasswd

Rights Management

Chown

Chgrp

chmod

Umask

Linux Rights Management