bash prompt options

    ########################################
    # set up prompt

    if [ "$UID" = "0" ]
    then
        pc='1;37;41'    # root: bright white on red
    elif [ -n "${SSH_CLIENT:-}" ]
    then
        pc='1;33;44'    # non-local: is yellow on blue
    else
        pc='1;30;42'    # local: bright black on green
    fi

    PROMPT_TOP_STAY=false
    PROMPT_TOP_ONLY=false

    if $PROMPT_TOP_STAY
    then
        p1='\[\e[s\e[H\e[0;'
        p2='m\e[K(\u@\h) \# \w\e[0m\e[2r\e[u\]\$ '
        PS1="$p1$pc$p2"
        unset p1 p2 pc
    elif $PROMPT_TOP_ONLY
    then
        p1='\[\e[s\e[H\e[0;'
        p2='m\e[K(\u@\h) \# \w\e[0m\e[u\]\$ '
        PS1="$p1$pc$p2"
        unset p1 p2 pc
    else
        p1='\[\e[0;'
        p2='m\](\u@\h) \# \w \$\[\e[0m\] '
        PS1="$p1$pc$p2"
        unset p1 p2 pc
    fi