PS1 environment variable manages it. Set it to
something in your .bashrc.bash twice (bash
inside bash) changes it, and also starts colouring the
output of ls, grep, etc..bashrc isn’t read on login, and you
need to open bash inside bash to make
it work.export PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
# (scroll to the right end)Some shells are not coloured by default or something. You might need to add these as well.
alias grep='grep --color'
alias ls='ls --color'
alias la='ls -A --color'
alias ll='ls -l --color'