#!/bin/bash

results=$(find . -name '*_1.txt')
for result in $results;do
    originFile=$(echo $result | sed 's/\(.*\)_1\(\..*\)/\1\2/g')
    if [ -f $originFile ];then
        echo "$originFile exist!"
        same=$(diff $result $originFile)
        if [ ! -n "$same" ];then
            echo 'file same'
            rm $result
        fi
    fi
done