edit the
~/.profile
and add:
PS1="\[\033[01;31m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\043 "
Caution
The PS1 provided in the source links break he terminal!
Rationale
The link is provided for the description of special characters only
source:
https://indibit.de/synology-diskstation-command-line-prompt-verbessern/