On Mon, Oct 31, 2022 at 8:19 PM Bryn Llewellyn <b...@yugabyte.com> wrote:
> > This is what I see. I have Ubuntu 20.04 LTS VM using Parallels Desktop > Version 18. > > # adduser 'dog$house' > adduser: To avoid problems, the username should consist only of > letters, digits, underscores, periods, at signs and dashes, and not start > with > a dash (as defined by IEEE Std 1003.1-2001). For compatibility with Samba > machine accounts $ is also supported at the end of the username > > I tried your longer version verbatim: > > useradd -m -s /bin/bash 'mac$crooge' > > and that quietly succeeded. I'd left out "-m" and "-s" because, for an > ordinary username, I get the home directory that I want and the (bash) > shell that I want without explicitly asking for these. > > It's bizarre that, merely by being explicit about these two fact, I'm now > allowed to have a name with a dollar-sign—notwithstanding what the text of > the earlier error message claimed. I wondered if that it wasn't an error > message at all—and was just a warning. But "cat /etc/passwd" showed me that > "dog$house" had not been created while "mac$crooge" HAD been. > > Also note the "useradd" != "adduser" - you are running two different commands. One of them is stock Linux while the other is provided by Ubuntu (probably Debian, actually, too lazy to research specifics). David J.
