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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?

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have a look at the man page for adduser. It will help you out. – Zoke Jan 9 '12 at 14:01
@Zoke I couldn't find the info I was looking for on the man page. – Lorin Hochstein Jan 9 '12 at 14:06
up vote 124 down vote accepted

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

Hope this helps you.

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Yeah, I can see how I missed that. "gecos" is not an obvious description – Lorin Hochstein Jan 9 '12 at 14:26

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
  • -s, --shell: Default shell for logon user

    Blank will use default login shell specified by the SHELL variable in /etc/default/useradd

  • Substitute <user> with the login name
  • Substitute <encryptedPassword> with the encrypted password

To generate your encrypted password you can use this perl language snippet:

password="1YelloDog@" # your chosen password
perl -e 'printf("%s\n", crypt($ARGV[0], "password"))' "$password"
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The options you mention don’t exist for adduser on my (recent) version of Ubuntu. – ᴠɪɴᴄᴇɴᴛ Sep 22 '15 at 20:30
@ᴠɪɴᴄᴇɴᴛ adduser is distinct from useradd, confusing I know. – ThorSummoner Sep 22 '15 at 21:01
Oops, indeed missed that you use its almost namesake … isn’t there a BDFL protecting the command line namespace? ;p – ᴠɪɴᴄᴇɴᴛ Sep 23 '15 at 9:52
It is not working, I cannot login SSH. – Kovacs Akos Dec 3 '15 at 8:58
@mum007 This is only general advice, try adding -v or -vv or -vvv to your ssh commands to see whats wrong and search your error messages here on SO or Google. – ThorSummoner Dec 3 '15 at 17:30

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