Get weblogic server plugin version

strings mod_wl.so | grep -i wlsplugins

Sample response:

WLSPLUGINS_11.1.1.7.0_SOLARIS.X64_130212.0859
WLSPLUGINS_11.1.1.7.0_SOLARIS.X64_130212.0859
WebLogic Server Plugin version 1.1 <WLSPLUGINS_11.1.1.7.0_SOLARIS.X64_130212.0859>