shell script: battery profilling

#1. Place the script in the phone's internal storage. 
#2.Give the command 'adb tcpip 5555' in the command line. This has to be given when the phone is connected to the laptop via usb cable.
#If successful, you will get the print "restarting in TCP mode port: 5555"
#3. Switch On the phone's hotspot and connect laptop to the hotspot.
#4. You can remove the usb cable now.
#5. Just check whether you can connect adb over tcpip by giving the below command.
#adb connect <ip of phone>:5555
#6. Login to adb shell using command 
#adb shell
#7. Go to the place where you have kept the script and run it using the below command.
#nice -n 19 sh batteryscript.sh &
#8. Now you can disconnect the laptop from the phone's hotspot.
#The script will run in the background and you will get the log in the file "batterystatus.txt" in the phone's storage.
#In some phones the command  "nice -n -19 sh batteryscript.sh &" will get inactive after sometime and data won't be saved if the phone gets locked for a long duration. 
#So if the batterystatus.txt file is not getting updated in any of the phones, try using the below command
#nohup sh batteryscript.sh </dev/null &
#And the output log will be saved in nohup.out.

while true
do
	var=`date`
	var1=`dumpsys battery | grep level`
	echo "$var $var1" 
	sleep 180
done