To find out the Tomcat version, find this file – version.sh for *nix or version.bat for Windows. This version.sh file is normally located in the Tomcat bin folder.
For example :
[email protected]:/usr/share/tomcat7/bin$ ./version.sh
Using CATALINA_BASE: /usr/share/tomcat7
Using CATALINA_HOME: /usr/share/tomcat7
Using CATALINA_TMPDIR: /usr/share/tomcat7/temp
Using JRE_HOME: /usr
Using CLASSPATH: /usr/share/tomcat7/bin/bootstrap.jar:/usr/share/tomcat7/bin/tomcat-juli.jar
Server version: Apache Tomcat/7.0.28
Server built: Apr 8 2014 08:47:08
Server number: 7.0.28.0
OS Name: Linux
OS Version: 3.15.4-x86_64-linode45
Architecture: amd64
JVM Version: 1.7.0_55-b14
JVM Vendor: Oracle Corporation