[tex-live] tu-clash

[Bob Tennent]

 >|On Sun, 26 Feb 2017, Bob Tennent wrote:
 >|>  >|fmtutil-sys --all
 >|>  >|
 >|>  >|should fix things most likely
 >|>
 >|> It doesn't. But fmtutil --all does. No doubt similar to
 >|
 >|No no no Bob, that is *bad*. The problem is with the update
 >|of the latex kernel, all the formats have already been updated, and
 >|they are in TEXMFSYSVAR. But you keep your private format dumps
 >|in TEXMFVAR, thus they override the update ones.
 >|
 >|Please *remove* the formats in TEXMFVAR unless you are sure you need
 >|them and want them.

I need a latex209 format to process a "legacy" document
and every year I have to figure out how to do it. No doubt
I don't do it right. I would be grateful if it could be
explained to me how to do it *permanently* as I doubt that
there's any updating of latex209 :+)

So in 

~/.texlive2016/texmf-var/web2c/tex

I see a latex209.fmt. Should I move it somewhere else? Can I
remove everything else from

~/.texlive2016/texmf-var/web2c ?

Bob T.