user mode linux
 

i am using fedora5,now i want to do linux from scratch,my system had only one partition tht is already fc5,so how can i do linux from scratch.
can i use user mode linux to install tht linux from scratch,if so how to do tht can u suggest me.

If u do not want to remove Fedora, then

u can either use bochs or vmware, and try any flavour of linux without risk ur exiting system.

what are bochs or vmware, can u help me how to install tht bochs or vmware ,after tht can i install linux from scratch,i dont have much knowlege abt this,i want to now how to do it

You can resize your fc5 partition with gparted, or any other partitioning program
bochs or vmware are virtual machines, you run a linux distro inside a vm, which wouldn't realy work with LFS because you need an existing system to compile it, or the LFS livecd, which you would need tons of resources to make a LFS system in a vm. Can I ask you why you are running FC5 when fedora 8 is out?

if i use Xen ,so tht i can do linux from scratch,is it possible,becoz i had already had fedora 5,if tht is possible can u tell me the steps to install xen.
thanks

You can use VirtualBox to create a virtual machine. It's nearly as good as VMware Workstation, but it's free for private non-commercial use.

Why don't you just resize your fedora core 5 partition?