File: unroll.awk

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# This filter requires one command line option of form -vN=n
# where n must be a decimal number.
#
# Repeat each input line containing $$ n times, replacing $$ with 0...n-1.
# Replace each $# with n, and each $* with a single $.

BEGIN {
	n = N + 0
}
{
	if (/\$\$/) { rep = n } else { rep = 1 }
	for (i = 0; i < rep; ++i) {
		tmp = $0
		gsub(/\$\$/, i, tmp)
		gsub(/\$#/, n, tmp)
		gsub(/\$\*/, "$", tmp)
		print tmp
	}
}