I have removed wrongly the /bin dir in Redhat el4.Instead of removing /media/usb/bin i cd to /media/usb
and did rm -rf /bin it removed every thing .The root also is denied from login ,How to solve this problem,please help me,it is urgent.
Thanks.

Reinstall RHEL4.

I wouldnt even bother trying to reconstruct the /bin dir without a decent system backup. It will be quicker to reinstall the OS, than try and work out some way to copy the bin files back in.

If on the other hand like the good sys admin you are, you made a full system backup when you first installed, then simply copy the backup /bin files back to the directory from a rescue cd, as cp and mv are also in /bin as i remember.

Maybe someone else can suggest something.

Heello,
you maybe able to get it/them from the boot cd disk.

But, then it is probably better to re-install the whole system

Ok, first of all, don't title your threads "very urgent", it does nothing to speed up responses but rather slow responses down. There is no priority on threads on a free forum, so make more descriptive titles so members that come here in their copious amounts of free time to help people like you know what your actual thread is about.

Now about your /bin directory and you mistakenly removing it, in the future do rm's with the full path to the directory or file you want to remove, do this after slapping yourself a few times for being dumb and removing your /bin directory.

Now, if you have a RHEL 4 cd that was maybe used to install this OS, use that to boot into rescue mode and repair the problem. Or if you have another RHEL system that is identical to this one, copy over the /bin directory from it to at least get a working machine back up. If none of these are possible and you have no backups, then it's reinstall time.

same thing was done by me accidently, at that time i didnt know about single mode ( init1 ) i had to reinstall.

And just to back up tricky, I wouldn't even be reading this thread if it (still) had "urgent" in the title.

Nothing to add to previous suggestions though.

In the future you might want to add an alias to your profile:

@dxqcanada
alias rm="rm -i" ( rm -i )doesnt work when you use rm with -rf

Hmmm, that blows that safety net.