I'm not sure if the useradd -m flag would overwrite your existing /home directory. I think
usermod(8) is what I'd try first.
What shell, of 3 possibilities (sh/csh/ksh), are you using?
The handbook indicates that ~/.profile will export the paths to all three shells. You could also copy the system configuration file for the particular shell you are using and then add the command to export the path for that particular shell.
https://docstore.mik.ua/orelly/unix3/upt/ch03_03.htm
http://www.netbsd.org/docs/misc/inde...adding-to-path