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Linux user management

2024-09-07 09:41:47   3  举报

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User Classification

root

regular users

system (virtual) users

User Files

/etc/passwd

/etc/group

/etc/shadow

/etc/skel

Used as a template for new user home directories.

User account

Add User

useradd -u 12345 -s /sbin/nologin -M mysql

Delete User

userdel

vim /etc/passwd # user

Modify User

user exist?

id username

view user information

grep username /etc/passwd

add user to root group

usermod -G root username

Query Users

whoami

Shows the current logged-in user

Displays user and group IDs and their names

cat /etc/passwd | grep username

uptime

who

last,lastlog

User Security

set a password and expiration time

Set or Change a User’s Password

sudo passwd username

Set Password Expiration Time

set the minimum days between password changes to 7 days, warn the user 5 days before the password expires, and set the account to be inactive for 15 days after expiration

sudo chage -m 7 -W 5 -I 15 username

password and account settings

sudo chage -l username

Sudo Privilege Escalation

visudo =vim /etc/sudoers

Alias-Based Security Protections

alias rm

vim /etc/profile G o alias rm='echo pls do not use rm'

vim ~/.bashrc #rm

force use rm

\rm -fr file

/bin/rm file

unalias rm

Jump Server

Bastion Host

no bastion host

history -c delete history

history -w writes the current shell's in-memory history to the history file (usually ~/.bash_history)

demo.jumpserver.org

Additional Content

Xshell doesnt work

git bash

powershell

 Collect

Get Started

classification management

 Collect

Get Started

Registration Management

 Collect

Get Started

delete user

 Collect

Get Started

user

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