（转载）http://blog.chinaunix.net/uid-14966892-id-2780401.html
Here is an answer from the "Frequently Asked Questions about the GNU C Library" (the FAQ): 4.9. How can I find out which version of glibc I am using in the moment? {UD} If you want to find out about the version from the command line simply run the libc binary. This is probably not possible on all platforms but where it is simply locate the libc DSO and start it as an application. On Linux like /lib/libc.so.6 This will produce all the information you need. What always will work is to use the API glibc provides. Compile and run the following little program to get the version information: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #include <stdio.h> #include <gnu/libc-version.h> int main (void) { puts (gnu_get_libc_version ()); return 0; } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This interface can also obviously be used to perform tests at runtime if this should be necessary.
Just execute:
ldd --version
which comes with glibc package