Add environment variables in Linux with a "."

Need to add a mdm.home environment variable on the project, the server is linux, and will be reported when added to normal "is not a valid identifier," get rid of "." Can be. Finally, by addressing the jvm Riga -Dmdm.home.
FIG normal increase given:

solution:

Increase in the tomcat catalina.sh which JAVA_OPTS="$JAVA_OPTS -Dmdm.home=/opt/Hugedata/mdmhome"resolved as follows