Creating an user without a password

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http://unix.stackexchange.com – I'm trying to create user without password like this: sudo adduser \ --system \ --shell /bin/bash \ --gecos ‘User for managing of git version control’ \ --group \ --disabled-password \ --home /home/git \ git It's created fine. But when I try to login under the git user I'm getting the password entering: su git Password:... When I leave it empty I get an error: su: Authentication failed What's wrong? (HowTos)