How to count no of lines in text file and store the value into a variable using batch script?

There is a much simpler way than all of these other methods.

find /v /c "" filename.ext

Holdover from the legacy MS-DOS days, apparently. More info here:

Example use:

adb shell pm list packages | find /v /c ""

If your android device is connected to your PC and you have the android SDK on your path, this prints out the number of apps installed on your device.

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