Script uses android adb to grab screen capture to PNG

gistfile1.txt

#!/bin/sh
############################################
# File: adb-cap.sh
# -----------------------
# Script to capture screenshot to file from adb connected Android device and saves to ~/Desktop.
#
# If no file name arg is found, a unique file name is created from current date.
#
# Ed Sutton
# Free for any use.
# Tested on macOS

# Debug on: set -x
#set -x

fileSaveFolder=~/Desktop
fileName=adb-cap-`date +%Y-%m-%d_%H-%M-%S`.png

# If user provided file name argument, then use it
if [ $# -eq 1 ]; then
    fileName="$1"
fi

# Add a png extension if user forgot
if ! [  `echo ${fileName: -4} | tr [:upper:] [:lower:]` == ".png" ]; then
   fileName=${fileName}.png
fi

fileNamePath=${fileSaveFolder}/${fileName}

adb exec-out screencap -p > ${fileNamePath}

echo Saved to:
echo ${fileNamePath}