#!/bin/bash
#FileName: ls_duplicate.sh

ls -lS --time-style=long-iso | awk 'BEGIN {
getline;getline;
prev_name=$8; size=$5;
}

{
cur_name=$8;
size_tmp=$5;

if (size==size_tmp)
{
    "md5sum " prev_name | getline;
    prev_md5_sum=$1;

    "md5sum " cur_name | getline;
    cur_md5_sum=$1;

    print(prev_name, prev_md5_sum, cur_name, cur_md5_sum);
    # if ( prev_md5_sum==cur_md5_sum ) { print prev_name; print cur_name;}
}

size=size_tmp; prev_name=cur_name;
}'

file1 b1946ac92492d2347c6235b4d2611184 file2 b1946ac92492d2347c6235b4d2611184
file2 -rw-rw-r-- file3 b1946ac92492d2347c6235b4d2611184