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You can quickly write a shell script that reads username, password from the keyboard, and add a username to the /etc/passwd and store encrypted password in /etc/shadow file using useradd command.
#!/bin/bash echo "Enter Username : " # read username and echo username in terminal read username echo "Enter Password : " # password is read in silent mode i.e. it will # show nothing instead of password. read -s password echo echo "Your password is read in silent mode."
You could also use chpasswd:
echo username:new_password | chpasswd
so, you change password for user username to new_password.
You can run the passwd command and send it piped input. So, do something like:
echo thePassword | passwd theUsername --stdin
I was asking myself the same thing, and didn't want to rely on a Python script.
This is the line to add a user with a defined password in one bash line:
useradd -p $(openssl passwd -crypt $PASS) $USER
The code below worked in Ubuntu 14.04. Try before you use it in other versions/linux variants.
# quietly add a user without password
adduser --quiet --disabled-password --shell /bin/bash --home /home/newuser --gecos "User" newuser
# set password
echo "newuser:newpassword" | chpasswd
I liked Tralemonkey's approach of echo thePassword | passwd theUsername --stdin though it didn't quite work for me as written. This however worked for me.
echo -e "$password\n$password\n" | sudo passwd $user
-e is to recognize \n as new line.
sudo is root access for Ubuntu.
The double quotes are to recognize $ and expand the variables.
The above command passes the password and a new line, two times, to passwd, which is what passwd requires.
If not using variables, I think this probably works.
echo -e 'password\npassword\n' | sudo passwd username
Single quotes should suffice here.
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