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I'd like to use the adduser command to add a user (with disabled password) via a shell script.
By default, adduser prompts you for various values (e.g., Full Name). Is there any way to submit these values via command line? Or will I need to useradd instead?
Use the --gecos option to skip the chfn interactive part.
adduser --disabled-password --gecos "" username
It's all in the man page. Not the most obvious formulation tho.
--gecos GECOS
Set the gecos field for the new entry generated. adduser will
not ask for finger information if this option is given.
The GECOS field is a comma separated list as such: Full name,Room number,Work phone,Home phone, despite that man page mentions finger information Details - Wikipedia
Hope this helps you.
useradd can also add users and does not appear to have any form of prompting built in.
useradd -m -p <encryptedPassword> -s /bin/bash <user>
-m, --create-home: Create user home directory-p, --password: Specify user password; skip to have it disabled-s, --shell: Default shell for logon user
Blank will use default login shell specified by the SHELL variable in /etc/default/useradd
<user> with the login name<encryptedPassword> with the encrypted passwordThere are a lot of crypt3 implementations that can generate a hashed password. The whole thing is your hashed password.
The resulting output format: the hash mechanism ($6 for sha-512), the random salt (the eight bytes after the second dollar sign $ASDF1234), remainder is the payload.
mkpasswd mkpasswd -m sha-512
(mkpasswd is provided by the whois package)
The resulting output format: first 2 bytes is your salt, remainder is the payload. The whole thing is your hashed password.
mkpasswd (provided by whois package)openssl passwd -cryptperl -e "print crypt('password');"python3 -c 'import crypt; print(crypt.crypt("password"))'
adduser on my (recent) version of Ubuntu.
-v or -vv or -vvv to your ssh commands to see whats wrong and search your error messages here on SO or Google.
Dec 3, 2015 at 17:30
sudo sed -i"" -e "s/PasswordAuthentication no/PasswordAuthentication yes/" /etc/ssh/sshd_config and sudo service ssh restart
You can combine what @ThorSummoner @Zoke are saying like so:
username=jovyan
password=jovyan
adduser --gecos "" --disabled-password $username
chpasswd <<<"$username:$password"
I'm doing this for my Jupyter docker-stack. It allows full headless setup in a Dockerfile.
chpasswd. Much easier than fiddling with mkpasswd to make the hashes manually, and way more script-friendly.
Jul 5, 2021 at 23:37
echo "${username}:${password}" | chpasswd