#!/usr/bin/env bash

# @(#) s1	Demonstrate coloration of diff output.
# colordiff - a tool to colorize diff output

# Infrastructure details, environment, commands for forum posts. 
set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
echo ; echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility \"version\")"
c=$( ps | grep $$ | awk '{print $NF}' )
version >/dev/null 2>&1 && s=$(_eat $0 $1) || s=""
[ "$c" = "$s" ] && p="$s" || p="$c"
version >/dev/null 2>&1 && version "=o" $p wdiff colordiff
set -o nounset
echo

echo " Samples of data files:"
specimen data1 data2 \
|| { head -5 $FILE ; echo " --" ; tail -5 $FILE; }

echo
echo " Results:"
wdiff -n data1 data2 |
colordiff

exit 0

% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 
GNU bash 3.2.39
GNU wdiff 0.5
colordiff diff (GNU diffutils) 2.8.1

 Samples of data files:
Whole: 5:0:5 of 7 lines in file "data1"
210	998877	phone	9981128209	add	111 nw st.
310	998877	usg	650	ex	11
310	998877	usg	850	ex	11
410	998877	web	1003		
210	998878	phone	9981128210	add	112 nw st.
310	998878	usg	750	ex	11
410	998878	web	930		

Whole: 5:0:5 of 7 lines in file "data2"
210	998877	phone	9981128209	add	111 nw st.
310	998877	usg	650	ex	11.00
310	998877	usg	750	ex	11
410	998877	web	1203		
210	998878	phone	9981128210	add	112 nw st.
310	998878	usg	750	ex	11
410	998878	web	850	

 Results:
210	998877	phone	9981128209	add	111 nw st.
310	998877	usg	650	ex	[-11-]	{+11.00+}
310	998877	usg	[-850-]	{+750+}	ex	11
410	998877	web	[-1003-]	{+1203+}		
210	998878	phone	9981128210	add	112 nw st.
310	998878	usg	750	ex	11
410	998878	web	[-930-]	{+850+}