Walter Mitty wrote:
> Aby recommendations how best to change a use login ID from "abc" to
> "def"?
> Just create new, copy "abc data" from ~abc to ~def? rename and chown?

# usermod -l def abc

You may also want to change and relocate the home directory. You might

need to tweak group names/memberships. You might also have to deal
with
issues such as mail spool files, sudoers entries, etc.

references/excerpts:
usermod(8)