/usr/share/lilypond/2.18.2/ly/grace-init.ly is in lilypond-data 2.18.2-12build1.
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 32 33 34 35 36 37 38 | \version "2.17.6"
startGraceSlur = #(make-music 'SlurEvent 'span-direction START 'spanner-id "grace")
stopGraceSlur = #(make-music 'SlurEvent 'span-direction STOP 'spanner-id "grace")
startGraceMusic = {
}
stopGraceMusic = {
}
startAppoggiaturaMusic =
{
<>\startGraceSlur
}
stopAppoggiaturaMusic = {
<>\stopGraceSlur
}
startAcciaccaturaMusic = {
<>\startGraceSlur
\temporary \override Flag.stroke-style = #"grace"
}
stopAcciaccaturaMusic = {
\revert Flag.stroke-style
<>\stopGraceSlur
}
startSlashedGraceMusic = {
\temporary \override Flag.stroke-style = #"grace"
}
stopSlashedGraceMusic = {
\revert Flag.stroke-style
}
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