Change prompt color dynamically

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I'm frequently logged into multiple different boxes concurrently. To help me keep track of which box I'm working on at the moment, I have this in my .bashrc file, which I keep rsynced across the various boxes.


# defines the color variables used below, including ${Normal}
# google "tput setaf" and "tput setab" for more information
. ~/.colors.sh  

if [ `id -u` -eq 0 ]; then
        Color=${RedBG}${White}  # red background for root
else
        case `hostname` in
                machine1 )
                        Color=${Blue}
                ;;
                machine2 )
                        Color=${Green}
                ;;
                machine3 )
                        Color=${Cyan}
                ;;
                machine4 )
                        Color=${Purple}
                ;;
                * )
                        Color=${Yellow}
                ;;
        esac
fi

PS1="${Color}$PS1${Normal}\n> "

.colors.sh:

Black="$(tput setaf 0)"
BlackBG="$(tput setab 0)"
DarkGrey="$(tput bold ; tput setaf 0)"
LightGrey="$(tput setaf 7)"
LightGreyBG="$(tput setab 7)"
White="$(tput bold ; tput setaf 7)"
Red="$(tput setaf 1)"
RedBG="$(tput setab 1)"
LightRed="$(tput bold ; tput setaf 1)"
Green="$(tput setaf 2)"
GreenBG="$(tput setab 2)"
LightGreen="$(tput bold ; tput setaf 2)"
Brown="$(tput setaf 3)"
BrownBG="$(tput setab 3)"
Yellow="$(tput bold ; tput setaf 3)"
Blue="$(tput setaf 4)"
BlueBG="$(tput setab 4)"
LightBlue="$(tput bold ; tput setaf 4)"
Purple="$(tput setaf 5)"
PurpleBG="$(tput setab 5)"
Pink="$(tput bold ; tput setaf 5)"
Cyan="$(tput setaf 6)"
CyanBG="$(tput setab 6)"
LightCyan="$(tput bold ; tput setaf 6)"
Normal="$(tput sgr0)" # No Color

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TesserId

Silly me, and I've been typing in those ANSI escape sequences all along. Thanks for the tput examples.

I also do a kind of hash on the hostname (instead of a case statement) to cover a larger number of host names. The following example gets 9 colors out of any number of host names:

case "$(( $( dc -e "$( hostname | cksum ) - p ) % 9 ))"

For user and group, I use a similar technique except that system level id's are separately detected to be marked with very bold colors.

Thanks Again.

Posted 2008-10-13 09:39:03

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