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I know these two commands to change density and resolution via Terminal:

wm density <dpi>
wm size <resolution>

But how do I change the scale of system-wide font via Terminal?

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This answer from StackOverflow (How to change font size by adb command) provides a solution. The command used to set the font size is:

adb shell settings put system font_scale {float_representing_the_scale}

or if you are using a terminal emulator in Android

settings put system font_scale {float_representing_the_scale}

Examples:

settings put system font_scale 0.5f
settings put system font_scale 1.2f

I tested it using Android 6.0 with root access (I was getting an error when using the command without root). I had to restart the phone for the setting to take effect.

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