It is very easy to add users by hand, but sometimes such actions needs to be automated.
The first thing to know is how to generate password using MD5-based algorithm beforehand.
Nothing more then
openssl utility is required.
$ openssl passwd -1 "password-string" $1$CgeyJuTw$DVasTHeH9D01C79lEj9i9.
Check output of the
openssl passwd --help command for additional information.
$ openssl passwd --help Usage: passwd [options] [passwords] where options are -crypt standard Unix password algorithm (default) -1 MD5-based password algorithm -apr1 MD5-based password algorithm, Apache variant -salt string use provided salt -in file read passwords from file -stdin read passwords from stdin -noverify never verify when reading password from terminal -quiet no warnings -table format output as table -reverse switch table columns
Create user without disclosing password
You can add new user inside custom shell script using hashed password.
user_password="$1$CgeyJuTw$DVasTHeH9D01C79lEj9i9." [...] useradd regularuser11 --create-home --password "$user_password" --shell /bin/bash --uid 5011 --user-group
Create user with disclosed password
Alternatively, you can generate password while adding new user without bothering about its security.
useradd regularuser12 --create-home --password "$(openssl passwd -1 "regularuser12-password")" --shell /bin/bash --uid 5012 --user-group
This is a simple solution, which is ideal for initial system configuration.