Once Again thanks for the useful info Shamrock.

let me ask you the last ques from your reply:
while (read(fd, (void *) name, (size_t) 5) == 5)

The "(size_t)5", what does it mean and will it do?Bcoz i read from a book that we need to give the sizeof() operator at the end. Also you are comaparing it to value "==5"? I could not understand here.

The below one is what I coded in my program: read(fd,name,sizeof(name));

Was mine a right one?