colorize output of Linux ip(8). suitable for replacement via alias (hopefully).

color_ip.sh

#!/bin/bash
# colorize output of Linux ip(8).  suitable to replacement via alias (hopefully).
# expects GNU sed.
#
# expanded from:
# http://unix.stackexchange.com/questions/148/colorizing-your-terminal-and-shell-environment

IP_CMD=/bin/ip

NORMAL=`echo -e '\033[0m'`
RED=`echo -e '\033[0;31m'`
LRED=`echo -e '\033[1;31m'`
GREEN=`echo -e '\033[0;32m'`
LGREEN=`echo -e '\033[1;32m'`
YELLOW=`echo -e '\033[0;33m'`
LYELLOW=`echo -e '\033[1;33m'`
BLUE=`echo -e '\033[0;34m'`
LBLUE=`echo -e '\033[1;34m'`
MAGENTA=`echo -e '\033[0;35m'`
LMAGENTA=`echo -e '\033[1;35m'`
CYAN=`echo -e '\033[0;36m'`
LCYAN=`echo -e '\033[1;36m'`

DEV='\<(lo|(eth|wlan)[0-9:]+)\>'
MAC='([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}'
IP4='([0-9]{1,3}\.){3}[0-9]{1,3}'
# http://stackoverflow.com/questions/53497/regular-expression-that-matches-valid-ipv6-addresses
IP6='(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]).){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]).){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))'
# whee
MASK='\/[0-9]+\>'

GOOD='\<(UP|REACHABLE)\>'
BAD='\<DOWN|STALE\>'

KEYWORD='\<(state|scope|label|lookup|from|mtu) ([A-Za-z0-9]*)\>'


DEV_C=$LMAGENTA
MAC_C=$MAGENTA
IP4_C=$LBLUE
IP6_C=$LCYAN
MASK_C=$YELLOW

GOOD_C=$LGREEN
BAD_C=$LRED

VALUE_C=$GREEN
DEFAULT_C=$LGREEN


"$IP_CMD" "$@" | sed  -r \
    -e "s/$DEV/${DEV_C}&${NORMAL}/g"\
    -e "s/$MAC/${MAC_C}&${NORMAL}/g"\
    -e "s/$IP4/${IP4_C}&${NORMAL}/g"\
    -e "s/$IP6/${IP6_C}&${NORMAL}/g"\
    -e "s/$MASK/${MASK_C}&${NORMAL}/g"\
    -e "s/$GOOD/${GOOD_C}&${NORMAL}/g"\
    -e "s/$BAD/${BAD_C}&${NORMAL}/g"\
    -e "s/$KEYWORD/\1 ${VALUE_C}\2${NORMAL}/g"\
    -e "s/link\/([a-z0-9]*)\>/link\/${VALUE_C}\1${NORMAL}/g"\
    -e "s/\<default\>/${DEFAULT_C}&${NORMAL}/g"\

This cool. I was searching for exactly this and it came up as the third result on Google. ip's output is so compact and hard to read. Thanks for saving me a lot of work doing it myself... especially those crazy regexes.

One note... in bash, this will do the same thing without calling echo:

RED=$'\033[0;31m'

From the bash manpage: "Words of the form $'string' are treated specially. The word expands to string, with back‐slash-escaped characters replaced as specified by the ANSI C standard." It goes on to define all the escapes it recognizes.