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Installing with --force option is always risky. The way to get back to glibc 2.2 is to get the right RPM (the version you had previously) and install it (with --force).
Glibc is used by many programs, so when it breakes there may be problems. The best way to update glibc is to update glibc with all programs using it. I don't know which version of RedHat you use...Do you have a tool for automatic upgrades with dependencies? Or if, you don't know, which version or RedHat do you use?
Thanks for the reply.
I am not sure which version of red hat linux I am using. How can check the version.
Also Is there a way to find out the exact version number of previous glibc. Will it be in a log file.
Do I have to remove glibc2.3 before installing the previous version or do I have to overwrite it. which way is better.
generally, unless your chrooted into an environment, you always overwrite. if you remove glibc, your system is hosed (even commands like ls, cd, rpm, virtually everything uses the standard c library in one way or another).