shell 删除某个目录下的重复文件

#!/bin/bash
ls -lS | awk 'BEGIN{
        getline;
        getline;
        name1=$;size=$;
}
{
        name2=$;
        sizeTmp=$;
        if(size==$){
                "md5sum "name1 | getline; csum1=$;
                "md5sum "name2 | getline; csum2=$;
                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  | cut -d ' ' -f3 > dup_save;
comm ./dup_file ./dup_sample - - | xargs rm -f