cat "sequence_file" | sed "s/^./ /g" | <!-- delete first character of each input line --> sed "s/t/u/g" | sed -f genetic-code.sed | sed "s/ / /g" | sed "s/[acgu]/ /g" | cat "sequence_file" | sed "s/^./ /g" | <!-- delete first character of each input line --> sed "s/t/u/g" | sed -f genetic-code.sed | sed "s/ / /g" | sed "s/[acgu]/ /g" |