SBT env

> export SBT_OPTS="-Xmx3g -XX:+CMSClassUnloadingEnabled -XX:PermSize=256M -XX:MaxPermSize=512M"
> sbt

- or -
> env SBT_OPTS="-Xmx3g -XX:+CMSClassUnloadingEnabled -XX:PermSize=256M -XX:MaxPermSize=512M" sbt

- or -
> SBT_OPTS="-Xmx3g -XX:+CMSClassUnloadingEnabled -XX:PermSize=256M -XX:MaxPermSize=512M" sbt