hehe,写完了，请大家指教吧。
我是在freebsd上面做的。
/*      fixdir.c -- delete the junk files under one board directory which do
         not exist in .DIR file
        version 1.0 author yeshao Mar.12 2002   */
/*      usage: fixdir source_dir_name dest_dir_name
        note:
        1.these dir names should not append the '/'
        2.fixdir only cp the files in .DIR file to the dest_dir
          you should delete the old files and then mv the files in dest_dir back.
*/


#include"stdio.h"
#include"string.h"
#include"stdlib.h"
#include"sys/file.h"

int main(int argc,char *argv[])
{
        FILE *fp;
        char line[256],cmd[100],source_dir[100];
        if(argc<3)
        {
                printf("usage: fixdir source_dir dest_dir\n");
                exit(0);
        }
        sprintf(source_dir,"%s/.DIR",argv[1]);
        fp=fopen(source_dir,"r");
        flock(fileno(fp),LOCK_EX);
        while(fread(line,256,1,fp))
        {
                sprintf(cmd,"cp %s/%14s %s/%14s",argv[1],line,argv[2],line);
                system(cmd);
        }
        flock(fileno(fp),LOCK_UN);
        fclose(fp);
}

【 在 yanglc.bbs@bbs.pku.edu.cn (谁都不守候) 的大作中提到: 】
: 写完后公开出来吧，利国利民，功德无量，呵呵。
--
修改:yeshao FROM 166.111.172.104
FROM 166.111.172.104