$ ls -l /usr/lib/libz*
lrwxrwxrwx  1 root root    15 Feb 14 20:24 /usr/lib/libz.so.1 -> libz.so.1.2.1.2
-rwxr-xr-x  1 root root 63624 Jul 21  2005 /usr/lib/libz.so.1.2.1.2