TeXbook example: Put something flush right on line if it fits, on next line otherwise

Question

I am certain I remember an example from the TeXbook where Knuth showed how to put something (I think it was the name of the author of a quote in the example) flush right on the last line of a paragraph if it fits, or flush right on the next line if it doesn't. (Very much like the LaTeX version in this answer.) However I can't seem to find it anymore.

Where in the TeXbook is this example? Or am I crazy and it doesn't exist?

score 3 · Accepted Answer · answered Nov 04 '21 at 12:04

Look in the index for “Bourbaki”

Bourbaki, Nicolas, 106.

On page 106 you find

\def\signed #1 (#2){{\unskip\nobreak\hfil\penalty50
  \hskip2em\hbox{}\nobreak\hfil\sl#1\/ \rm(#2)
  \parfillskip=0pt \finalhyphendemerits=0 \par}}

See https://tex.stackexchange.com/a/91564/4427

TeXbook example: Put something flush right on line if it fits, on next line otherwise

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