UUID C库
http://linux.die.net/man/3/libuuid

uuidtest.c 



#include <stdio.h>
#include <uuid/uuid.h>

int main(int argc, char **argv){
  uuid_t uuid;
  char str[36];
  uuid_generate(uuid);
  uuid_unparse(uuid, str);
  printf("%s \n", str);
  return 0;
}



mac下 不需要 链接uuid库 
gcc uuidtest.c 

Linux 编译 链接uuid库
gcc uuidtest.c -luuid
uuidtest.c:3:23: 致命错误：uuid/uuid.h：没有那个文件或目录

yum install uuid uuid-devel
yum install libuuid libuuid-devel

gcc uuidtest.c -luuid 
编译ok

./a.out
09425627-aad0-4789-8209-4ccf00dae299 


https://gitee.com/dyyx/hellocode/blob/master/web/tech/c/demo/uuidtest.c



uuid 命令
man uuid 
# generate DCE 1.1 v1 UUID (time and node based)
uuid -v1
01c47915-4777-11d8-bc70-0090272ff725
        
# generate DCE 1.1 v3 UUID (name based)
uuid -v3 ns:URL http://codefun007.xyz/
c638027d-1d84-3ea0-ac14-90b1dc381bfc


# generate DCE 1.1 v4 UUID 4 (random data based)
uuid -v4
eb424026-6f54-4ef8-a4d0-bb658a1fc6cf