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This article is to share with you the content of a sample analysis of account management in linux. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

/ etc/passwd system account information

/ etc/shadow account password information is encrypted by MD5 32-bit

Add "*" in front of the password bar! "prohibit the use of an account

/ etc/group system group information

/ etc/gshadow

Newgrp changes the landing group

Useradd & adduser establishes a new user useradd-m test automatically sets up a user's login directory

Useradd-m-g pgroup test specifies the level to which it belongs

/ etc/default/useradd related settings

/ etc/login.defs UID/GID related settings

Passwd change password passwd test

Usermod modifies user account

Userdel deletes the account userdel-r test

The SHELL used by chsh when replacing the login system [- l] shows the available SHELL; [- s] to modify its own SHELL.

Chfn changes the information displayed by the finger instruction

Finger finds and displays user information

Id displays the user's ID id test

Groupadd add Group

Groupmod is similar to usermod

Groupdel delete group

Su test change user su-enter root and use the environment variable of root

Sudo executes instructions in another capacity

Visudo editor / etc/sudoers adds a line of "test ALL= (ALL) ALL"

% wheel ALL = (ALL) sudo is available to users of all wheel groups in the ALL system

% wheel ALL = (ALL) NOPASSWD: all users in the ALL wheel group do not use the password NOPASSWD

User_Alias ADMPW = vbird, dmtsai, vbird1, vbird3 join the ADMPW group

ADMPW ALL = NOPASSWD:! / usr/bin/passwd, / usr/bin/passwd [A-Za-z] *,\

! / usr/bin/passwd root can change the user's password, but not the root password (add before the instruction! Representative is not allowed)

PAM (Pluggable Authentication Modules, embedded module)

Who & w to see who is online

Last's recently logged-in host information

Lastlog last logged in time read / var/log/lastlog

Talk talks to other users

Write send message write test [ctrl] + d send

Mesg sets the write permission of the terminal mesg n forbids receiving mesg y

Wall sends messages to all users wall this is q test

Mail writes mail

/ etc/default/useradd home directory default settings

Quota shows the space used by the disk and limits quota-guvs shows the current root's own quota limit

Quota-vu query

Quotacheck checks disk usage space and limits quotacheck-avug all in / etc/mtab, including partition supported by quota

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