tfc_say(" oseek=val: seek destination file/device by these val bytes.");
tfc_say(" count=val: process only these val bytes, both input and output.");
tfc_say(" xkey=val: take only val bytes from user keyfile.");
tfc_say(" oseek=val: seek destination file/device by these val bytes.");
tfc_say(" count=val: process only these val bytes, both input and output.");
tfc_say(" xkey=val: take only val bytes from user keyfile.");