This file is indexed.

/usr/share/lilypond/2.14.2/ly/grace-init.ly is in lilypond-data 2.14.2-4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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\version "2.14.0"

startGraceSlur = #(make-music 'SlurEvent 'span-direction START 'spanner-id "grace")
stopGraceSlur = #(make-music 'SlurEvent 'span-direction STOP 'spanner-id "grace")


startGraceMusic =  {
}

stopGraceMusic =  { 
}

startAppoggiaturaMusic =
 {
    s1*0\startGraceSlur
}

stopAppoggiaturaMusic =  { 
    s1*0\stopGraceSlur
}

startAcciaccaturaMusic =  {
    s1*0\startGraceSlur
    \override Stem  #'stroke-style = #"grace"
}

stopAcciaccaturaMusic =  {
    \revert Stem #'stroke-style
    s1*0\stopGraceSlur
}