O bash do Gentoo é muito massa! :D

Para instalá-lo no Arch Linux (ou em distribuições derivadas como KahelOS), certifique-se de que tem o Yaourt instalado e faça o seguinte:

# yaourt -Sy gentoo-bashrc

O arquivo bashrc não será substituído imediatamente. Você precisa executar como usuário normal o comando:

sudo cp -f /usr/share/gentoo-bashrc/bashrc ~/.bashrc

E depois logado como root:

# cp -f /usr/share/gentoo-bashrc/bashrc ~/.bashrc

Feito isso, ao reiniciar o terminal, a primeira coisa que perceberá é alteração das cores do prompt.

Caso queira conferir o arquivo:

# /etc/bash/bashrc
#
# This file is sourced by all *interactive* bash shells on startup,
# including some apparently interactive shells such as scp and rcp
# that can't tolerate any output.  So make sure this doesn't display
# anything or bad things will happen !


# Test for an interactive shell.  There is no need to set anything
# past this point for scp and rcp, and it's important to refrain from
# outputting anything in those cases.

if [[ $- != *i* ]] ; then
	# Shell is non-interactive.  Be done now!
	return
fi

# Bash won't get SIGWINCH if another process is in the foreground.
# Enable checkwinsize so that bash will check the terminal size when
# it regains control.  #65623
# http://cnswww.cns.cwru.edu/~chet/bash/FAQ (E11)
shopt -s checkwinsize

# Enable history appending instead of overwriting.  #139609
shopt -s histappend

# Change the window title of X terminals 
case ${TERM} in
	xterm*|rxvt*|Eterm|aterm|kterm|gnome*|interix)
		PROMPT_COMMAND='echo -ne "{TEXTO}33]0;${USER}@${HOSTNAME%%.*}:${PWD/$HOME/~}{TEXTO}07"'
		;;
	screen)
		PROMPT_COMMAND='echo -ne "{TEXTO}33_${USER}@${HOSTNAME%%.*}:${PWD/$HOME/~}{TEXTO}33\\"'
		;;
esac

use_color=false

# Set colorful PS1 only on colorful terminals.
# dircolors --print-database uses its own built-in database
# instead of using /etc/DIR_COLORS.  Try to use the external file
# first to take advantage of user additions.  Use internal bash
# globbing instead of external grep binary.
safe_term=${TERM//[^[:alnum:]]/?}   # sanitize TERM
match_lhs=""
[[ -f ~/.dir_colors   ]] && match_lhs="${match_lhs}$(<~/.dir_colors)"
[[ -f /etc/DIR_COLORS ]] && match_lhs="${match_lhs}$(</etc/DIR_COLORS)"
[[ -z ${match_lhs}    ]] \
	&& type -P dircolors >/dev/null \
	&& match_lhs=$(dircolors --print-database)
[[ $'\n'${match_lhs} == *$'\n'"TERM "${safe_term}* ]] && use_color=true

if ${use_color} ; then
	# Enable colors for ls, etc.  Prefer ~/.dir_colors #64489
	if type -P dircolors >/dev/null ; then
		if [[ -f ~/.dir_colors ]] ; then
			eval $(dircolors -b ~/.dir_colors)
		elif [[ -f /etc/DIR_COLORS ]] ; then
			eval $(dircolors -b /etc/DIR_COLORS)
		fi
	fi

	if [[ ${EUID} == 0 ]] ; then
		PS1='\[{TEXTO}33[01;31m\]\h\[{TEXTO}33[01;34m\] \W \$\[{TEXTO}33[00m\] '
	else
		PS1='\[{TEXTO}33[01;32m\]\[email protected]\h\[{TEXTO}33[01;34m\] \w \$\[{TEXTO}33[00m\] '
	fi

	alias ls='ls --color=auto'
	alias grep='grep --colour=auto'
else
	if [[ ${EUID} == 0 ]] ; then
		# show [email protected] when we don't have colors
		PS1='\[email protected]\h \W \$ '
	else
		PS1='\[email protected]\h \w \$ '
	fi
fi

# Try to keep environment pollution down, EPA loves us.
unset use_color safe_term match_lhs