Create user account on many servers

Question

I have a users.txt with the following content:

ip1 user1 password1
ip2 user2 password2
....
ipN userN passwordN

I want to create one user on each of these servers. I want to use this script on each server:

user_login="some_user7"
password="blablabla"

sudo adduser $user_login --gecos "First Last,RoomNumber,WorkPhone,HomePhone" --disabled-password

echo -e "$password\n$password\n" | sudo passwd $user_login

I don't understand, how correctly connect on each server and execute this script.

P.S. I don't want to use SSH-public keys. I want to use just logins and passwords.

Answer 1

To execute a script on a server using ssh is simple, something like:

cat script.sh | ssh someserver

However, you probably do not want to execute the same script on every server. You will need another script to read your users.txt and from that file create script files for each line in users.txt before calling ssh with a newly created script as input. You could use sed to replace user and password in some template file.

Or, you could use awk to do all the work:

awk '{system("ssh \""$1 " sudo adduser " $2 " --disable-password ; echo -e \\\""$3"\\n"$3"\\n\\\" | sudo passwd "$2"\"")}' < users.txt