Escape $ dollar sign on Makefiles

I just learned that if you want to use a dollar sign inside a Makefile you need to escape $ with an extra $, so double it. Otherwise make will think that you are accessing a make variable, not a shell one.

on shell:

#!/bin/bash
for i in *; do echo "i=$i"; done

on Makefile:

#!make
my-files:
	for i in *; do echo "i=$$i"; done

Here's a reference

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