nixpkgs/nixos/modules/installer/tools/nixos-version.sh

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#! @shell@
case "$1" in
-h|--help)
exec man nixos-version
exit 1
;;
--hash|--revision)
echo "@revision@"
;;
--json)
cat <<EOF
@json@
EOF
;;
*)
echo "@version@ (@codeName@)"
;;
esac