Posts Tagged ‘passwd’

Hey Friends !!

This Post is for All Red hat Linux Distribution users, Who Have Lost Thier Root  password or Who Want Privileged Access For a Physically Accessible System !!

The Scenario is That you don’t know the root password. ::

So Here We Begin

To Remove root password in Red Hat follow these instructions ::

When System Successfully boot, it will ask for username and password. But you don’t know the root’s password. To change the root password you need to boot the system into single user mode. You can pass the some of the important kernel arguments from the boot loader if your target system’s Boot loader is unprotected.

Firstly Reboot system with alt + ctrl + del key combinations
Press space bar on boot loader screen

remove root password

This will drop you in OS selection screen
Select linux (If you have multibooting then select linux)

From grub boot loader screen select kernel parameter line and press “E”

remove root password

Select the JLine starting from kernel /vmlinuz…
remove root password in linux


In kernel editing mode press space bar and write s in the end of line just after the rhgb quiet and press enter key that will bring in grub bootloader screen
remove root password

On grub boot loader screen press b

remove root password in linux


This change will tell to boot system in single user mode.
After loading essential modal kernel will drop in rescue mode with root prompt
remove root password


now run passwd command to reset root password
and init 5 command to run system in graphic mode or you can just reboot system to on its default run level
remove root password

++++++++++++++++++By Ankit Pandey +++++++++++++++++++++

How do I create create a new Linux user account ?

What are command line options for adding a user?

To create a new user account under any Linux distribution use the command called “useradd” .  The system administrator is responsible for creating account. Login as root user (or use sudo command).

useradd Command Syntax

# useradd [options] {username}

Depending on command line options, the useradd command will update system files (/etc/passwd and /etc/shadow file with password) and may also create the new user’s home directory and copy initial files.

Linux add a New user “test”

Type the command as follows:

#useradd test
Setting a password for test:

#passwd test
Without password user account will be in locked status. To unlock the account, you need to use above passwd command. Use passwd command to assign a password.

Set account disable date

You can set date for the account to be disabled in the format YYYY-MM-DD with -e option while creating account itself:
#useradd -e {yyyy-mm-dd} {username}
#useradd -e 2008-12-31 test

Set default password expiry

The -f {days} option set number of days after the password expires until the account is disabled. (If 0 is specified, the account is disabled immediately after the password expires. If -1 is specified, the account is not be disabled after the password expires.)
useradd -f {days} {username}
useradd -e 2009-12-31 -f 30 test