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are you sure the version of adduser you are using has a "--groups" option? I suggest you read the man page. Anyway, a bigger problem seems to be that you did not specify the user (which is a mandatory parameter).
seems you did not read the man page. On my system, the man page indicates that the --groups option is is only valid when using --system (which presumably is not what you want). Perhaps what you want is --ingroup.
Need to be a little careful here, both useradd and adduser can be different on different systems. It's best to read the man pages on the system in use (useradd on my Debian does not have a --group option, and nor does the man page linked to above).
what's the difference between home-dir and base-dir? is home dir, their home directory, and base-dir, where they are always set by default?
the fist option listed in the man page...
-b, --base-dir BASE_DIR
The default base directory for the system if -d HOME_DIR is not specified. BASE_DIR is concatenated with
the account name to define the home directory. If the -m option is not used, BASE_DIR must exist.
Regarding defaults, also from the man page:
Default values for account creation.
Yes- I think what it is doing in the tutorial, is giving the directory permissions to the user and the group.
Are you not able to allow a group access to a home directory? Isn't that what they are esentially doing, with "testuser:ftpaccounts"?