Did you install tomcat? If yes then CATALINA_HOME=/path/to/tomcat (where /path/to/tomcat is the directory where tomcat is installed). You set this variable with:
Code:
export CATALINA_HOME=/path/to/tomcat
To start tomcat you must also
Code:
export JAVA_HOME=/path/to/java
Then the startup script (/path/to/tomcat/bin/startup.sh) run all the scripts needed to set the environment for tomcat to start. Among them is the CLASSPATH variable