colour-bash.sh

#!/bin/bash

# some utility functions (not used)
str256() { echo $((0x$(echo $1|md5sum|cut -c-4)%256)); }
str2color() { echo -e "\033[38;5;$(str256 "$1")m$1\033[00m"; }

# create a new host-colour file if not exists (allows manual override)
HOSTNAME_COLOUR_FILENAME="$HOME/.$(hostname)-colour"
test -f "$HOSTNAME_COLOUR_FILENAME" || \
    echo $((0x$(hostname|md5sum|cut -c-4)%256)) > "$HOSTNAME_COLOUR_FILENAME"

# set new PS1
HOSTNAME_COLOUR=$(cat "$HOSTNAME_COLOUR_FILENAME")
PS1=$'\[\e]0;\u@\h: \w\a\]${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u\[\033[00m\]@\[$(tput bold)\]\[\033[38;5;${HOSTNAME_COLOUR}m\]\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '