/usr/share/lilypond/2.18.2/ly/lilypond-book-preamble.ly is in lilypond-data 2.18.2-4.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | \version "2.16.0"
%% toplevel \book gets output per page,
%% everything else gets output per system/title
#(define default-toplevel-book-handler
print-book-with-defaults-as-systems )
#(define toplevel-book-handler
(lambda ( . rest)
(set! output-empty-score-list #f)
(apply print-book-with-defaults rest)))
#(define toplevel-music-handler
(lambda ( . rest)
(apply collect-music-for-book rest)))
#(define toplevel-score-handler
(lambda ( . rest)
(apply collect-scores-for-book rest)))
#(define toplevel-text-handler
(lambda ( . rest)
(apply collect-scores-for-book rest)))
#(set! output-empty-score-list #t)
#(ly:set-option 'backend 'eps)
#(ly:set-option (quote no-point-and-click))
#(define inside-lilypond-book #t)
#(define version-seen #t)
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