Gentoo's modification of /etc/bashrc for a colored Bash

.bashrc

# Gentoo's modification of /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

# Disable completion when the input buffer is empty.  i.e. Hitting tab
# and waiting a long time for bash to expand all of $PATH.
shopt -s no_empty_cmd_completion

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

# Save each command to the history file as it's executed.  #517342
# This does mean sessions get interleaved when reading later on, but this
# way the history is always up to date.  History is not synced across live
# sessions though; that is what `history -n` does.
# Disabled by default due to concerns related to system recovery when $HOME
# is under duress, or lives somewhere flaky (like NFS).  Constantly syncing
# the history will halt the shell prompt until it's finished.
#PROMPT_COMMAND='history -a'

# # Change the window title of X terminals 
# case ${TERM} in
# 	[aEkx]term*|rxvt*|gnome*|konsole*|interix|tmux*)
# 		PS1='\[\033]0;\u@\h:\w\007\]'
# 		;;
# 	screen*)
# 		PS1='\[\033k\u@\h:\w\033\\\]'
# 		;;
# 	*)
# 		unset PS1
# 		;;
# esac

# 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.
# We run dircolors directly due to its changes in file syntax and
# terminal name patching.
use_color=false
if type -P dircolors >/dev/null ; then
	# Enable colors for ls, etc.  Prefer ~/.dir_colors #64489
	LS_COLORS=
	if [[ -f ~/.dir_colors ]] ; then
		eval "$(dircolors -b ~/.dir_colors)"
	elif [[ -f /etc/DIR_COLORS ]] ; then
		eval "$(dircolors -b /etc/DIR_COLORS)"
	else
		eval "$(dircolors -b)"
	fi
	# Note: We always evaluate the LS_COLORS setting even when it's the
	# default.  If it isn't set, then `ls` will only colorize by default
	# based on file attributes and ignore extensions (even the compiled
	# in defaults of dircolors). #583814
	if [[ -n ${LS_COLORS:+set} ]] ; then
		use_color=true
	else
		# Delete it if it's empty as it's useless in that case.
		unset LS_COLORS
	fi
else
	# Some systems (e.g. BSD & embedded) don't typically come with
	# dircolors so we need to hardcode some terminals in here.
	case ${TERM} in
	[aEkx]term*|rxvt*|gnome*|konsole*|screen|tmux|cons25|*color) use_color=true;;
	esac
fi

if ${use_color} ; then
	if [[ ${EUID} == 0 ]] ; then
		PS1='\[$(tput setaf 6)\][\d \A]\[$(tput bold)\]\[$(tput setaf 1)\] \u\[$(tput setaf 2)\]@\[$(tput setaf 3)\]\h \[$(tput bold)\]\[$(tput setaf 4)\]\w\[$(tput bold)\]\[$(tput setaf 1)\] \\$\[$(tput sgr0)\] '
	else
		PS1='\[$(tput setaf 6)\][\d \A]\[$(tput bold)\]\[$(tput setaf 2)\] \u\[$(tput setaf 0)\]@\[$(tput setaf 3)\]\h \[$(tput setaf 4)\]\w\[$(tput bold)\]\[$(tput setaf 2)\] \\$\[$(tput sgr0)\] '
	fi

	#BSD#@export CLICOLOR=1
	#GNU#@alias ls='ls --color=auto'
	alias grep='grep --colour=auto'
	alias egrep='grep -E --colour=auto'
	alias fgrep='grep -F --colour=auto'
else
	# show root@ when we don't have colors
	PS1='\[\033]0;\u@\h:\w\007\]\u@\h \w \$ '
fi

for sh in /etc/bash/bashrc.d/* ; do
	[[ -r ${sh} ]] && source "${sh}"
done

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