/usr/share/lilypond/2.16.2/ly/scheme-sandbox.ly is in lilypond-data 2.16.2-3.
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 | \version "2.16.0"
#(load-user-init)
% This loads the user's .guile file for interactive sessions.
% One typical thing you might want to put there is
% (use-modules (ice-9 readline))
% (activate-readline)
% in order to activate command line editing for interactive sessions.
% You need libreadline support and the respective Guile module to be
% installed for that. In Debian, for example, this is part of the
% guile-1.8-libs package. Depending on your system and version, the
% requirements may be different.
#(newline)
#(scm-style-repl)
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