Download confirmation now not prompts me!

[Parshwa Murdia]

hi,
In a sudden changing manner, now if I try to update the system, using
the command,

[fedorax at localhost ~]$ su -
Password:
[root at localhost ~]# yum update

It doesn't prompt me to type in 'y' or 'n' if some downloadable update
is there unlike earlier when I used to type in 'yes' to download a
particular package of some size and update the system. Not only in
this command but in some other commands also, I have the same thing
repeating when I am not being prompted for tying in 'y' or 'n' for the
confirmation of download. Why could this happen all of a sudden?
--

Regards,
Parshwa Murdia