tomcat启动报错：The BASEDIR environment variable is not defined correctly

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[root@test bin]# sh startup.sh

The BASEDIR environment variable is not defined correctly
This environment variable is needed to run this program

[root@test bin]# chmod 777 -R /bin
[root@test bin]# sh startup.sh
Using CATALINA_BASE:   /usr/local/apache-tomcat-6.0.36
Using CATALINA_HOME:   /usr/local/apache-tomcat-6.0.36
Using CATALINA_TMPDIR: /usr/local/apache-tomcat-6.0.36/temp
Using JRE_HOME:        /usr
Using CLASSPATH:       /usr/local/apache-tomcat-6.0.36/bin/bootstrap.jar