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int main()
{
pid_t pid, pr;
pid = fork();
if(pid > 0)
{
printf("child id:%d\n", pid);
do
{
pr = waitpid(pid, NULL, WNOHANG);
} while(pr == 0);
}
else if(pid == 0)
{
execlp("./Child", "./Child", " > out", (char*)0); //execlp启动已成程序(./Child)
}
return 0;
}