(lilypond-program.info)Updating files with convert-ly

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3.4 Updating files with `convert-ly'
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The LilyPond input syntax is routinely changed to simplify it or improve
it in different ways.  As a side effect of this, the LilyPond
interpreter often is no longer compatible with older input files.  To
remedy this, the program `convert-ly' can be used to deal with most of
the syntax changes between LilyPond versions.

   It uses `\version' statements in the input files to detect the old
version number.  In most cases, to upgrade your input file it is
sufficient to run

     convert-ly -e myfile.ly

MacOS X users may execute this command under the menu entry `Compile >
Update syntax'.

   If there are no changes to myfile.ly and file called myfile.ly.NEW
is created, then myfile.ly is already updated.

Command line options for convert-ly

Problems with convert-ly