Listing only directories in linux

ls -d */

Install android apk using adb with all permissions granted by default

adb install -g myAndroidApplication.apk

Clear android Application data using shell command

adb shell pm clear com.app.packageName

Reset a specific permission of android package

adb shell pm revoke com.app.packageName android.permission.WRITE_EXTERNAL_STORAGE

Reset all granted permissions to a android package

adb shell pm reset-permissions -p com.app.packageName

Get environment variables passed to android/linux process

adb shell cat /proc/238/environ | sed -e "s/\x0/\n/g"

Pass environment variables to pythons using sudo while invoking it

sudo -E PYTHONPATH=${PYTHONPATH} LD_LIBRARY_PATH=${LD_LIBRARY_PATH} python

Set/Get global android device settings using command line

adb shell settings put global bluetooth_disabled_profiles 6

adb shell settings put global device_provisioned 1

adb shell settings list global

adb shell settings list system

adb shell settings list secure

adb shell settings get global bluetooth_on

Trim leading and trailing whitespace using sed

sed -i 's/^[ \t]*//;s/[ \t]*$//' filename

Create simple webserver in python

To create simple web server in python run below command in shell
python -m SimpleHTTPServer 5000
this will start serving pages at the address http://localhost:5000 and will show files from the location from where command is ran.

How to set/unset Windows 10 to boot in safe mode using command prompt

After reboot press ESC then F11 to enter system recovery mode, then select Troubleshooting then "Advanced Options" then "Command Prompt".

After command prompt appears type following
bcdedit /set {default} safeboot minimal and press Enter. or
bcdedit /set {default} safeboot network and press Enter. or
bcdedit /set {default} safebootalternateshell yes and press Enter.

Close command prompt

On "Choose an option" screen press Continue

To Unset the safe mode booting, follow above steps till command prompt and then enter command
bcdedit /deletevalue {default} safeboot and press Enter.