How do I set or change Linux system password for any user account?
Both Linux and UNIX use the passwd command to change user password. The passwd is used to update a user’s authentication token (password) stored in shadow file.
The passwd changes passwords for user and group accounts. A normal user may only change the password for his/her own account, the super user (or root) may change the password for any account. The administrator of a group may change the password for the group. passwd also changes account information, such as the full name of the user, user's login shell, or password expiry date and interval.
Task: Set or Change User Password
Type passwd command as follows to change your own password:
$ passwd
Output:
Changing password for vivek (current) UNIX password: Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully
The user is first prompted for his/her old password, if one is present. This password is then encrypted and compared against the stored password. The user has only one chance to enter the correct password. The super user is permitted to bypass this step so that forgotten passwords may be changed.
A new password is tested for complexity. As a general guideline, passwords should consist of 6 to 8 characters including one or more from each of following sets:
- Lower case alphabetics
- Upper case alphabetics
- Digits 0 thru 9
- Punctuation marks
Task: Change Password For Other User Account
You must login as root user, type the following command to change password for user vivek:
# passwd vivek
Output:
Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully
Where,
- vivek - is username or account name.
Task: Change Group Password
When the -g option is used, the password for the named group is changed. In this example, change password for group sales:
# passwd -g sales
The current group password is not prompted for. The -r option is used with the -g option to remove the current password from the named group. This allows group access to all members. The -R option is used with the -g option to restrict the named group for all users.
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{ 35 comments… read them below or add one }
Could you help me how to edit the commands before booting in CentOS? I can’t seem to get it right.
choose the desired OS, in this case CentOS then press e for edit then select the kernel then press e again and type space linuxsingle then enter to accept changes, press b for boot. They told me that a prompt will appear but there is none so that i can type passwd to change the password and username. Pls. help me.
i want to change my user password on my laptop the one i use to log in
thanks this help alot
hi!
I am Aloka . I am student of computer science & I have linux on my machine.
i forgotten the username & password of it.
can u help me for this for changing the username & password.
plz help me.
fist open the window than Alt+Ctrl+f1 after that login passwd and type use name and password
I have done the Alt + CTRL + F1, because I’m new user to LINUX how can I know User and the login password?
I just want to know password for whenever i click on the network, i have to enter a password to continue the next command. n I don’t understand why it kept prompt the command to enter the pass. thanks
hi
useradd u1
passwd u1
Go to linux rescue mode (single user mode) at the boot prompt when the linux image is loaded and reset your password through the prompt.
Hey, i want to set my password so that when my linux laptop starts up, my account name comes up and i have to type my password in so that others cannot access my account settings without my password. Help me please!? x
Hi
As a root user I want to reset lost of passwords and want to set each users password with a single command i.e. not have to be asked to type passwords afterwords. So the command needs to include the new password and not require the old one.
Help would be greatly appreciated
How can I change the root password while I’m only a user of it? Please reply me, as fast as can be.
Varun use sudo su
use your user pass
then run passwd
if your user account dont have privlages enough to run as su, your sol.
AeSix, Don’t you know how can I get or reset password of another user if i am user with limited privilages?! help please….
Hi,
how can i set an UNSECURE password? During installation process i’m able to set an unsecure password, but it isn’t possible once the system is installed. I know it’s a bad
practice, but i really need to do it.
Anyone?
Thanks.
Try logging in as root or using $ sudo passwd username
There you can set whichever password you want, which might not be the case when you run the passwd command as a user.
i ,m forget passwd then i can do
I am using Cant OS 5.2 with DC & BDC, pls advise if any tool available to monitor it easily from nework.
hello,can u help me out to find out hw to change the passwd wen previous passwd has been forgotten ??????? u have suggested somebody to go to the rescue mode what dose it mean ,plz describe whole procedure in detail! thanks in anticipation!~
is there anyway to READ the password of user instead of reset it if I have root access?
Any files in Linux support that? Thanks in advance
I want to know how to know d previos password of d super user…how can it be done??
or change d password of d superuser without having to know d previous one…is dis possible??
Any help will be greately appritiated…
Helpful. Thanks.
when it says type unix password it doesnt let me type what can i do
It doesn’t show you a caret but just type ahead. Unix terminals work like that when asking for passwords. Supposedly it’s intended to prevent those looking over your shoulder from seeing how long your password is.
thank you that helped
hello,
i have created 70 users in Ubuntu using following shell script,
#!/bin/sh
for i in $(seq 1 70)
do
useradd -d/home/te$i -m te$i
done
Now i want to set default password say “xyz” to all 70 users (te1 to te70).
How can I do so?
thnx in advance
#!/bin/sh
for i in $(seq 1 70)
do
useradd -d/home/te$i -m te$i
echo $i:xyz | chpasswd
chage -d 0 $i
done
Notice the echo line? You should also set the line after, which tells users to change their password when they login. You can remove this if you wish.
I m dr nandinee in maharastra forgoten my password plz help me
hello nandini which flavour r u using…..
Hi Karthi, It’s not important what flavor to use…
The good flavor comes from the questioner, I need to add your flavor…
Can you please contact me for the purpose of cooking you in order to extract your flavor?
set the password by using passwd command how to do in shell scripting
Hi,
Thanks for the information. Could you please help me how to create virtual screens like tty/8 ty/9 etc.
Thanks in advance
hi!
I am satish. I am student of computer science & I have linux on my machine.
i forgotten the username & password of it.
can u help me for this for changing the username & password.
plz help me.
hi
i forgot the forgot to enter into my linux os…. can u help me how to reset it….
How a user is able to change his own password /etc/shadow file when he doesn’t have even read permission on it?