Re: -bash: /bin/grep: cannot execute binary file

On Sat, Oct 18, 2008, Semih Gokalp wrote:
>
>   Hi all,I have problem on CentOS 5.2
> while everything is working great,suddenly i have this error when i
>   login my server,

This could well mean that your system has been cracked.  These
programs are frequently changed in common root exploits.  You can
run ``rpm -V packagename'' to check for package corruption:

The command ``rpm -qf /bin/egrep'' will show the package name to
which /bin/egrep belongs.  A lazy way to handle this is:

rpm -V `rpm -qf /bin/egrep`
rpm -V `rpm -qf /bin/hostname`

The most common reason these programs don't run after a root
exploit is that the cracker has replaced them with binaries from
another distribution and the binaries are looking for shared
libraries that are not on the cracked system.

Bill