The following is a list of command-line options that I’ve noticed are in common usage. In bold are the uses that I believe must be the default.
-f
-t
as “to type”, e.g. -f svg -t png
to convert form SVG to PNG)-h
-H
instead)-i
-o
as “output file”)-o
-i
as “input file”)-q
-r
-t
-f
as “from type” e.g. -f svg -t png
to convert form SVG to PNG)-v