Linux Manually add Users

You can add users directly under Linux using Useradd, and we can also try to add users by editing/etc/passwd,/etc/group, and/etc/shadow files. The steps are as follows:

[[email protected] ~]# ID CentOS
Id:centos:No such user

Add CentOS users this time.

1. Vim/etc/group

Add a row

centos:x:508:

2. vim/etc/passwd

Add a row at the end

Centos:x:508:508::/home/centos:/bin/bash

3. Generate a MD5 value for a password with Grub-md5-crypt

[Email protected] home]# Grub-md5-crypt
Password:
Retype Password:
$1$fb3an$nyiggztvzws1xhcqvof5t.

4. Vim/etc/shadow

Add a row

Centos:$1$fb3an$nyiggztvzws1xhcqvof5t.:1664:0:99999:7:::

5. Initializing the user home directory with/etc/skel

Cp-r/etc/skel//home/centos

The specific features of/etc/skel can be found in the following blog posts http://blog.csdn.net/todd911/article/details/8299018

6. Also need to modify the directory permissions of/home/centos, only the user itself has full permissions to the directory, other users and groups have no permissions to this directory.

[Email protected] home]# Cd/home
[email protected] home]# LL
Total 950236
Drwxr-xr-x. 2 root root 4096 01:57 CentOS
DRWX------. 2 Gentoo gentoo 4096 01:49 Gentoo
-rw-r--r--. 1 root root 382955520 Jul 05:10 Linux-2.6.32.67.tar
-rw-r--r--. 1 root root 590069760 Jul 04:29 Linux-4.0.5.tar
[Email protected] home]# chmod-r go=---centos/
[Email protected] home]# chown-r Centos:centos centos/
[email protected] home]# LL
Total 950236
DRWX------. 2 CentOS centos 4096 01:57 CentOS
DRWX------. 2 Gentoo gentoo 4096 01:49 Gentoo
-rw-r--r--. 1 root root 382955520 Jul 05:10 Linux-2.6.32.67.tar
-rw-r--r--. 1 root root 590069760 Jul 04:29 Linux-4.0.5.tar

Detect whether to add success

[Email protected] home]# Su-centos
[Email protected] ~]$ pwd
/home/centos

[[email protected] home]# ID CentOS
uid=508 (CentOS) gid=508 (CentOS) groups=508 (CentOS)

This article is from the "My Technology Life" blog, make sure to keep this source http://duf0913.blog.51cto.com/6360025/1683159

Linux Manually add Users