$ cat device/samsung/dreamlte/AndroidProducts.mk; ls ; . ./build/env_setup.sh ; lunch;

$ cat devicesamsungdreamlteAndroidProducts.mk; ls ; . .buildenv_setup.sh ; lunch;

$ cat device/samsung/dreamlte/AndroidProducts.mk
#
# Copyright (C) 2019 The LineageOS Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

PRODUCT_MAKEFILES := \
    $(LOCAL_DIR)/lineage_dreamlte.mk

COMMON_LUNCH_CHOICES := \
    lineage_dreamlte-eng \
    lineage_dreamlte-user \
    lineage_dreamlte-userdebug \

$ ls ; . ./build/env_setup.sh ; lunch
Android.bp
art
bionic
bootable
bootstrap.bash
build
compatibility
cts
dalvik
developers
development
device
external
frameworks
hardware
kernel
libcore
libnativehelper
Makefile
manifest
out
packages
patches
pdk
platform_testing
prebuilts
sdk
system
test
toolchain
tools
vendor
bash: ./build/env_setup.sh: No such file or directory
bash: lunch: command not found