Grace Type Settings

Control code	Description
\f{x}	switch to font named "x"
\f{n}	switch to font number n
\f{}	return to original font
\R{x}	switch to color named "x"
\R{n}	switch to color number n
\R{}	return to original color
\#{x}	treat "x" (must be of even length) as list of hexadecimal char codes
\t{xx xy yx yy}	apply transformation matrix
\t{}	reset transformation matrix
\z{x}	zoom x times
\z{}	return to original zoom
\r{x}	rotate by x degrees
\l{x}	slant by factor x
\v{x}	shift vertically by x
\v{}	return to unshifted baseline
\V{x}	shift baseline by x
\V{}	reset baseline
\h{x}	horizontal shift by x
\n	new line
\u	begin underline
\U	stop underline
\o	begin overline
\O	stop overline
\Fk	enable kerning
\FK	disable kerning
\Fl	enable ligatures
\FL	disable ligatures
\m{n}	mark current position as n
\M{n}	return to saved position n
\dl	LtoR substring direction
\dr	RtoL substring direction
\dL	LtoR text advancing
\dR	RtoL text advancing
\x	switch to Symbol font (same as \f{Symbol})
\+	increase size (same as \z{1.19} ; 1.19 = sqrt(sqrt(2)))
\-	decrease size (same as \z{0.84} ; 0.84 = 1/sqrt(sqrt(2)))
\s	begin subscripting (same as \v{-0.4}\z{0.71})
\S	begin superscripting (same as \v{0.6}\z{0.71})
\T{xx xy yx yy}	same as \t{}\t{xx xy yx yy}
\Z{x}	absolute zoom x times (same as \z{}\z{x})
\q	make font oblique (same as \l{0.25})
\Q	undo oblique (same as \l{-0.25})
\N	return to normal style (same as \v{}\t{})
\\	print \
\n	switch to font number n (0-9) (deprecated)
\c	begin using upper 128 characters of set (deprecated)
\C	stop using upper 128 characters of set (deprecated)

Disclaimer: I got this on the internet. I do not remember the exact site. All credit goes to the original uploader.