$ adb shell csi -p '"(software-version)"'
linux

$ adb shell csi -p '"(software-type)"'
unix

$ adb shell csi -p '"(features)"'
(csi: srfi-28: extras: data-structures: ports: srfi-31: srfi-26: srfi-16: srfi-15: srfi-11: srfi-8: module-environments: hygienic-macros: syntax-rules: srfi-0: srfi-2: srfi-6: srfi-9: srfi-46: srfi-55: srfi-61: chicken-4: chicken-4.8: ptables: dload: little-endian: arm: gnu: linux: unix: chicken: srfi-6: srfi-10: srfi-23: srfi-30: srfi-39: srfi-62: srfi-17: srfi-12: srfi-88: srfi-98: irregex-is-core-unit:)