How to create user and group in linux redhat server

hii guy today we will learn and discuss that how can we create group and user in linux server and also learn how to provide  different -2 permission every user or group on specify  file .For example we look any company or organisation  employ schedule in some person can read only schedule .but some person can manipulation in schedule .so we will learn how to do it basically like this work depend on read ,write. execute permission .

 so let we start create user in linux redhat server

[root@localhost ~]# useradd joon
[root@localhost ~]# passwd joon
Changing password for user joon.
New UNIX password:12345
BAD PASSWORD: it is too short
Retype new UNIX password:12345
[root@localhost ~]# useradd robet
[root@localhost ~]# passwd -d robet
Removing password for user robet.
passwd: Success
[root@localhost ~]# userdd peetr
-bash: userdd: command not found
[root@localhost ~]# useradd peetr
[root@localhost ~]# passwd -d peetr
Removing password for user peetr.
passwd: Success
[root@localhost ~]# useradd jully
[root@localhost ~]# passwd -d jully
Removing password for user jully.
passwd: Success

we can remove user

[root@localhost ~]# userdel -r joon(we can remove all user like this

how to create group and user add  in group

[root@localhost ~]# groupadd demo
[root@localhost ~]# usermod -G demo robet
[root@localhost ~]# usermod -G demo peetr
[root@localhost ~]# usermod -G demo jully
( note check group)[root@localhost ~]# cat /etc/group

how can we provide permission in group and user ,other

here  look we have u1,u2,u3, user and HELLO group in jully robut brad user. And file owner (user) joon .we can look through cmd(command) that how we provide each user and group read write execution permission(here we need some  new user  diagram according )

-
[root@localhost ~]# useradd u1
[root@localhost ~]# passwd -d u1
Removing password for user u1.
passwd: Success
[root@localhost ~]# useradd u2
[root@localhost ~]# passwd -d u2
Removing password for user u2.
passwd: Success
[root@localhost ~]# useradd u3
[root@localhost ~]# passwd -d u3
Removing password for user u3.
passwd: Success
[root@localhost ~]# groupadd hello
[root@localhost ~]# usermod -G hello jully
[root@localhost ~]# useradd robut
[root@localhost ~]# passwd -d robut
Removing password for user robut.
passwd: Success
[root@localhost ~]# usermod -g hello robut
[root@localhost ~]# chown joon data
[root@localhost ~]# chgrp hello data
[root@localhost ~]# setfacl -M g:rw,u=rwx,o=r data
[root@localhost ~]# ls -l
drwxr-xr-x 2 joon hello       4096 Dec 13 00:36 data

thank you

 by – vishnu sharma