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 :

mkyong@hcompass:/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
 

find out the installed and runing tomcat version in Linux