@node Invoking LilyPond

@chapter Invoking LilyPond
@cindex Invoking LilyPond
@cindex command line options
@cindex options, command line
@cindex switches

Usage:

@example
        lilypond @var{[OPTION]} ... @var{[file]}...
@end example

@unnumberedsec Options

@table @code

@item -e,--evaluate=@var{code}
  Evaluates the Scheme @var{code} before parsing @file{.ly}
files. Multiple @code{-e} options may be given. They will be evaluated
sequentially.

@item -f,--format=@var{format}
Output format for sheet music. Choices are @code{tex} (for @TeX{}
output), @code{ps} (for PostScript), @code{scm} (for a Scheme
dump), and @code{as} (for ASCII-art).

@c TODO: TFMFONTS

For processing both the @TeX{} and the PostScript output, you must have
appropriate environment variables set.  For @TeX{}, you have to set
@code{MFINPUTS} and @code{TEXINPUTS} to point to the directory
containing LilyPond metafont and .tex files.  For processing PostScript
output with Ghostscript you have to set @code{GS_FONTPATH} to point to
the directory containing LilyPond PFA files.

Scripts to do this are included in
@file{buildscripts/out/lilypond-profile} (for sh shells) and
@file{buildscripts/out/lilypond-login} (for C-shells), and should
normally be run as part of your login process.


@item -h,--help
Show a summary of usage.
@item --include, -I=@var{directory}
Add @var{directory} to the search path for input files.
@cindex file searching
@cindex search path
@item -i,--init=@var{file}
Set init file to @var{file} (default: @file{init.ly}).
@item -m,--no-paper
@cindex MIDI
Disable @TeX{} output. If you have a @code{\midi} definition midi output
will be generated.
@item -M,--dependencies
Output rules to be included in Makefile.
@item -o,--output=@var{FILE}
Set the default output file to @var{FILE}.
@item -s,--safe
Disallow untrusted @code{\include} directives, in-line
Scheme evaluation, backslashes in @TeX{}, code.

@strong{WARNING}: the @code{--safe} option has not been reviewed for a
long time; do not rely on it for automatic invocation (e.g. over the
web). Volunteers are welcome to do a new audit.

@item -v,--version
Show version information 
@item -V,--verbose
Be verbose: show full paths of all  files read, and give timing
information.

@item -w,--warranty
Show the warranty with which GNU LilyPond comes. (It comes with 
@strong{NO WARRANTY}!)
@end table


When invoked with a filename that has no extension, LilyPond will try to
add @file{.ly} as an extension first.

When LilyPond processes @file{filename.ly} it will produce
@file{filename.tex} as output (or @file{filename.ps} for PostScript
output).  If @file{filename.ly} contains more than one @code{\score}
block, then LilyPond will output the rest in numbered files, starting
with @file{filename-1.tex}.  Several files can be specified; they will
each be processed independently.  @footnote{The status of GUILE is not
reset across invocations, so be careful not to change any default
settings from within Scheme .}

@section Environment variables

@table @code
@item LILYINCLUDE
additional directories for finding lilypond data.  The
format is like the format of @file{PATH}.
@item LILYPONDPREFIX
This specifies a directory where locale messages and
data files will be looked up by default. The directory should contain
subdirectories called @file{ly/}, @file{ps/}, @file{tex/}, etc.

@item LANG
selects the language for the warning messages of LilyPond.
@end table