the command to get the list of files is
fmsadmin list files
So I think the command for the CSR is wrong too...
Yes, both commands were wrong but it was not clear and the documentation for Certificate generation was very hard to find. I found a link embedded in a blog comment.
Page 191 on this document provides syntax and instructions for certificates in FMS. https://fmhelp.filemaker.com/docs/13/en/fms13_help.pdf
Why don't you type on terminal
fmsadmin help list