User Management Utility commands (version 2)

User Management Utility commands (version 2)
User management commands

Pwck # detect the/etc/passwd file # If the/etc/passwd is incorrect, the system will prompt

Vipw # edit the/etc/passwd file. The only difference between vipw and VI will lock the/etc/passwd file.

Id # view User id and group information

Finger [username] # view User details [you may need to install it on your own]

Su switching user # added-there will be an environment variable to switch to the Home Directory [added-,-left and right spaces], while su will not

Passwd-S [username] # view the User Password status

Passwd-d # delete user password

Passwd-l or usermod-L # Lock the user

# Usage: for example, this user has violated regulations and does not need to be used for a long time. Principle Analysis: add one or two more passwords to the/etc/shadow file! Because the length of the md5 encryption password is fixed, in this case, the password cannot match!

Passwd-u or usermod-U # unlock a user

Who, w # view the current login user information, w displays more details

Up indicates the time when the system is running.

Users logging on locally: ppy1, ppy2...

Remote login users: pts/1, pts/2...

Chage [Option] [username] # managing passwords

-L view user password settings

-M: minimum number of days for password Modification

-Maximum number of days for M password Modification

-D Date of last password Modification

-I. the number of days the account is locked after the password expires

-E: Set the password expiration date. If it is 0, the password will expire immediately. If it is-1, the password will never expire.

-W: set the number of days before the password expires.

User Group Management commands

Add User Group:

Groupadd name

Groupadd-g 888 webadmin # create a user group webadmin whose GID is 888

Delete user group:

Groupdel [group name]

Modify user group information:

Groupmod-n

Groupmod-n apache webadmin # modify the name of the webadmin group to apache

 

Expansion command:

Group

Newgrp switching User Group

Grpck user group configuration file detection, similar to pwck usage and Significance

Chgrp modify the group to which the file belongs

Edit the/etc/group file in vigr and lock the file during editing.

Manually delete a user

Use the find command to find files belonging to a user or user group:-user,-uid,-group,-gid

For example, find/home-user test

1. Move and back up files to be retained

2. Delete unnecessary files

3. Clear related table items in the User File

4. Clear the user's home directory

Expansion-

[Enable/disable the shadow function]

Pwconv/pwunconv

Kgconv/grpunconv

[Authconfig]

Linux provides more powerful tools to change many settings

Permanently valid. edit/etc/sysconfig/authconfig.

[Use graphical tools for management]

System-config-[Tab] [Tab]

System-config-users # Set users