Linux Add root level account

a command
Useradd-p ' OpenSSL passwd-1-salt ' lsof ' admin '-u 0-o-G root-g root-s/bin/bash-d/usr/bin/lsof lsof

Command explanation

Useradd adding users

-P ' OpenSSL passwd-1-salt ' lsof ' admin ' This refers to the user's password is set, the inside of the lsof is almost the key and the like, can be casually written, admin is plaintext password

-U 0-o Adding a user with a UID of 0 is relative to the root level.
-G root-g Root adds a user to the root group
-s/bin/bash Specify the shell path of the new user
-d/usr/bin/lsof New user's home directory, you can define your own
Lsof the user name of the new user

Second, clone account

Of course, we can use cloning to do a root account directly.

New Normal User system
# Useradd System
# passwd System

Add root Shell

# VIM/ETC/PASSWD

System:x:0:0:root:/root:/bin/bash

# Vim/etc/shadow
system:$1$ouljnnw/$kAyt 7s.rztjwswllfli3f1:14921:0:99999:7:::

Add into Root group

#vim/etc/group
Root::0:root,systems

Test environment: CentOS 5.5

1, add the user, first with the AddUser command to add a normal user, the command is as follows:

Add a user named Tommy #passwd Tommy   //Change password for Tommy.  Password//Enter a new password here password//Enter the new password successfully again.        

2. Give root permission

Method One: Modify the/etc/sudoers file, locate the following line, remove the previous comment (#)

# # allows people in group wheel to run all commands%wheel all    =(   All 

Then modify the user to belong to the root group (wheel) with the following command:

#usermod-G root Tommy

After the modification, you can now log in with your Tommy account, and then use the command Su-to get root privileges to operate.

Method Two: Modify the/etc/sudoers file, locate the following line, and add a line under root as follows:

# allow ROOT to run any commands anywhereroot all                All

After the modification, you can now log in with your Tommy account, and then use the command Su-to get root privileges to operate.

Method Three: Modify the/etc/passwd file, locate the following line, change the user ID to 0, as follows:

Tommy: x: £ º:Tommy:/home/tommy:/bin/bash 

Modified as follows

Tommy:x:0::Tommy:/home/tommy:/bin/bash   

Save, with Tommy account login, directly get the root account permissions.

Friendly reminder: Although method three looks simple and convenient, but generally not recommended use, recommended method two.

"All For Success"

Linux Add root level account