shell 删除某个目录下的重复文件

#!/bin/bash
ls -lS | awk 'BEGIN{
        getline;
        getline;
        name1=$9;size=$5;
}
{
        name2=$9;
        sizeTmp=$5;
        if(size==$5){
                "md5sum "name1 | getline; csum1=$1;
                "md5sum "name2 | getline; csum2=$1;
                if(csum1=csum2){
                        print name1;
                        print name2;
                }
        }
        size=sizeTmp;
        name1=name2;
}
' | sort -u > dup_file
cat dup_file | xargs -i md5sum {} | sort -u | uniq -w 32 | cut -d ' ' -f3 > dup_save;
comm ./dup_file ./dup_sample -2 -3 | xargs rm -f