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#include <stdio.h>
#include <unistd.h>
int main() {
const char *msg = "Hello, world!\n";
// 使用 write 系统调用向标准输出（文件描述符 1）写入数据
ssize_t result = write(1, msg, 14);
if (result == -1) {
perror("write failed");
return 1;
}
printf("Successfully wrote %zd bytes.\n", result);
return 0;