Hi All,
i am using redhat enterprise 5.7
after do all configuration i need for any thing
is there any way to reset all configuration
1- i don't have backup
this is not a problem i face
but i assume this may be happen
so i am asking about any command back redhat to the status after installation directly
What configuration exactly is the one you're trying to reset?
There isn't a "master configuration file" in RHEL.
Depending on the software you have installed you may be able to just overwrite some files under /etc from a RHEL vanilla install. You need to do that manually (and be very careful) since not all files will work by just replacing them (E.g.: passwd, shadow, fstab, sysctl.conf, etc.)
It'd be useful if you elaborate a bit on the issue you're facing.
I bet you are used to solaris (*) and wants a "Linux-equivalent" to :
sys_unconfig
or even
touch /reconfigure ; init 6
well, AFAIK there is no such a "simple" thing (in Linux - that is)
HTH
good luck, and success !
alexandre botao
progsmith, polymath, creator.
("comets never dodge")
(*) P.S.: if not, the conclusion still applies 
You just described the problem in a nutshell.
try sys-unconfig