Program usage, three issues

[Francisco Vila]

Hello. In 3.2.1 Invoking lilypond it reads

When filename.ly is processed it will produce filename.tex as output...

I think it should read that it will produce filename.pdf.

Then I try to run it using a dash to accept stdin input, but it
doesn't seem to work:
echo '\version "2.11.43" {c d e }' | lilypond - -o test
Processing `-'
Parsing...
Interpreting music...
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...
Layout output to
`-.ps'.../usr/local/lilypond/usr/share/lilypond/current/scm/framework-ps.scm:750:9:
In procedure simple-format in expression (ly:warning (_ "cannot
convert <stdout> to ~S" "PDF")):
/usr/local/lilypond/usr/share/lilypond/current/scm/framework-ps.scm:750:9:
FORMAT: Missing argument for ~S

Then I try to use the tex backend on a trivial file (has it ever worked?)

$ lilypond -dbackend=tex test.ly
GNU LilyPond 2.11.43
Processing `test.ly'
Parsing...
Interpreting music...
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...
Layout output to
`test.tex'.../usr/local/lilypond/usr/share/lilypond/current/scm/framework-tex.scm:197:26:
While evaluating arguments to last-pair in expression (last-pair
pages):
/usr/local/lilypond/usr/share/lilypond/current/scm/framework-tex.scm:197:26:
Unbound variable: pages

I could send three separate messages for these, but I wonder that the
response is simply that "program usage is outdated" for all three.

I could update it if only I knew the response...
-- 
Francisco Vila. Badajoz (Spain)
http://www.paconet.org