linux ln 命令

软连接也叫符号连接，相关的命令为ln，指定选项 -s则为软连接，否则为硬连接，-f为若有相同的文件则删掉。不管是软连接还是硬链接，都不是复制，软硬连接区别如下：

下面这段代码就涉及到这个。以后还可以好好看看。

void searchvDisk(const char *path)
{
    cleanvDiskArray();
    DIR * dp;
    struct  dirent* entry;
    struct  stat   statbuf;
    if((dp = opendir(path)) == NULL)
    {
        return;
    }
    chdir(path);
    while((entry=readdir(dp)) != NULL)
    {
        stat(entry->d_name,&statbuf);
        if   (S_ISDIR(statbuf.st_mode))
        {
            if(strcmp( ". ",entry->d_name)==0||strcmp( ".. ",entry->d_name)==0)
            {
                continue;
            }
            //printf( "%*s%s/\n ",depth, "   ",entry   ->   d_name);
            //showdir(entry   ->   d_name,depth+4);
        }
        else
        {
            char buffer[BUFLEN];
            memset(buffer,0,BUFLEN);
            if(readlink(entry->d_name,buffer,BUFLEN-1))  //buffer is ../sdx
            {
                char *p=NULL;
                p=strchr(buffer,'/');
                p++;
                char devname[20]={0};
                memcpy(devname,p,strlen(buffer)-(p-buffer));
                setvDiskArray(devname,entry->d_name);
            }
        }
    }
    chdir( ".. ");
    closedir(dp);
}

参考连接：

http://www.cnblogs.com/sonic4x/archive/2011/08/05/2128543.html
http://www.cnblogs.com/joeblackzqq/archive/2011/03/20/1989625.html