diffconfig.sh

#########################################################################
# File Name: diffconfig.sh
# Author: Carbon (ecrasy@gmail.com)
# Description: feel free to use
# Created Time: 2022-07-26 10:58:29 UTC
# Modified Time: 2023-02-27 08:21:06 UTC
#########################################################################

#!/bin/bash

usage() { echo "Usage: $0 <config file1> <config file2>" 1>&2; exit 1; }
if [ $# -ne 2 ]; then
    usage
fi

[[ -e $1 && -e $2 ]] || exit 0

IFS_old=$IFS
IFS=$'\n'

var1=$1
var2=$2
ext1="${var1##*.}"
ext2="${var2##*.}"
src1="${var1%%.*}"
src2="${var2%%.*}"

file1="$src1.tmp.$ext1"
file2="$src2.tmp.$ext2"
common="$(dirname $var1)/common.$ext1"

[  -e "$common" ] && { rm -f $common; }

# remove empty lines
sed '/^$/d' $var1 > $file1
sed '/^$/d' $var2 > $file2

for line1 in $(cat  $file1)
do
    for line2 in $(cat $file2)
    do
        if [ "$line1" =  "$line2" ]
        then
            echo $line1 >> $common
            # echo $line2
        fi
    done
done

filter=$(cat $common)

result1="$src1.out.$ext1"
result2="$src2.out.$ext2"

grep -vE "$filter" $file1 > $result1
grep -vE "$filter" $file2 > $result2

# clean up
[  -e "$file1" ] && { rm -f $file1; }
[  -e "$file2" ] && { rm -f $file2; }

IFS=$IFS_old