Other missing options in the switch structure are: -b[rev], -I, -M (this one does nothing by now, but it exists and is undocumented in the usage), and -tstr. I suppose that these options are just not implemented in OpenRCS right now.
There is an -e option in the rcs(1)'s usage both with and without an argument: it appears in [-eIiLqTUV] and as -e[users]. I suppose that the brackets here show that the argument is optional. In this case, the -e in [-eIi...] seems superfluous. Best regards, Igor.
