Calculation of used heap size in EAP 6

Issue

• We are using below cli command to get the used heap size only but we are are not getting any output from this command.

jboss-cli.sh -c command="/core-service=platform-mbean/type=memory:read-resource(include-runtime=true, recursive=true, recursive-depth=10)" | head -9 | grep -i used | grep -o '[0-9]*"

While below command is working

jboss-cli.sh -c command="/core-service=platform-mbean/type=memory:read-resource(include-runtime=true, recursive=true, recursive-depth=10)" | head -9 | grep -i used

o/p -

"used" => 1108962808L

• We want only used heap size in mb , what L denotes after the size of memory?