Documentation for the standalone shell can be found here
To build this from the command line on Unix or MacOS:
Run ./gradlew tools:shell-cli:buildShellCli to create a fat JAR in tools/shell-cli/build/libs
To build this from the command line on Windows:
Run gradlew tools:shell-cli:buildShellCli to create a fat JAR in tools/shell-cli/build/libs