How To Modify Default Settings For Adding New Users

How to modify default settings for adding new users -- that all directories and files created by new users should have full access permissions (rwx) for the owner and none for group members and all other users?

Thanks

Specifying the “-D” switch on its own will simply display the default settings, while specifying -D in conjunction with other switches will change the defaults to those values.

# useradd -D

GROUP=100
INACTIVE=-1HOME=/home
INACTIVE=-1
EXPIRE=
SHELL=/bin/bash
SKEL=/etc/skel

# useradd -D -s /bin/sh

# useradd -D

GROUP=100
HOME=/home
INACTIVE=-1
EXPIRE=
SHELL=/bin/sh
SKEL=/etc/skel

As you can see, this changes the default shell for created users from “bash” to “sh”.


Perameters
d home directory

-s starting program (shell)

-p password

-g (primary group assigned to the users)

-G (Other groups the user belongs to)

-m (Create the user’s home directory )

I maybe wrong but I think what you need to change is the umask
man umask for more info not 100% sure.

Suspect it's similar to the above to change the default and I suspect the octal will be something like 0077