Make ADB script for outputting a file with root

make-adb-root-cat.sh

#!/bin/bash

# ./make-adb-root-cat.sh                              # call the script that generates the remote script
#     /data/data/com.whatsapp/databases/msgstore.db   # supply the path to the file to output
#   | adb shell                                       # send the script to the android device
#   > msgstore.db                                     # save the output to a file

# `su -c 'cat filename'` is the command sent to the device
# requires the device to be rooted

if [ $# -eq 0 ]; then
  >&2 echo "No arguments supplied"
  exit 1
fi

echo "su -c 'cat $1'"