libreoffice --headless --convert-to odt ./*doc
I have seen and used this solution already in the past, due some strange restriction it was necessary to run the command as root. Currently such a restriction does not apply. Tested on
CentOS Linux release 7.2.1511, libreoffice-writer-4.3.7.2-5.el7_2.1.x86_64.PS. conversion to epub is as usual:
ebook-convert file.odt file.epub \ --authors "Scheer, Karl Herbert" \ --title "Perry Rhodan: Odlet MARCA POLA" \ --series "Perry Rhodan" \ --series-index 450