1.2 Command-line usage

This section contains extra information about using LilyPond on the command-line. This may be desirable to pass extra options to the program. In addition, there are certain extra ‘helper’ programs (such as midi2ly) which are only available on the command-line.

By ‘command-line’, we mean the command line in the operating system. Windows users might be more familiar with the terms ‘DOS shell’ or ‘command shell’. MacOS X users might be more familiar with the terms ‘terminal’ or ‘console’. Some additional setup is required for MacOS X users; please see MacOS X.

Describing how to use this part of an operating system is outside the scope of this manual; please consult other documentation on this topic if you are unfamiliar with the command-line.


Invoking lilypond

The lilypond executable may be called as follows from the command line.

lilypond [option]… file

When invoked with a filename that has no extension, the ‘.ly’ extension is tried first. To read input from stdin, use a dash (-) for file.

When ‘filename.ly’ is processed it will produce ‘filename.ps’ and ‘filename.pdf’ as output. Several files can be specified; they will each be processed independently. 1

If ‘filename.ly’ contains more than one \book block, then the rest of the scores will be output in numbered files, starting with ‘filename-1.pdf’. In addition, the value of output-suffix will be inserted between the basename and the number. An input file containing

#(define output-suffix "violin")
\score { … }
#(define output-suffix "cello")
\score { … }

will output base-violin.pdf’ and base-cello-1.pdf’.


Standard shell commands

If your shell (i.e. command window) supports normal redirects, then you might find it useful to use the following commands to redirect console output to a file:

Consult the documentation for your shell to see if it supports these options, or if the syntax is different. Note that these are shell commands and have nothing to do with lilypond.


Basic command line options for LilyPond

The following options are supported:

-d, --define-default=var=val

See Advanced command line options for LilyPond.

-e, --evaluate=expr

Evaluate the Scheme expr before parsing any ‘.ly’ files. Multiple ‘-e’ options may be given, they will be evaluated sequentially.

The expression will be evaluated in the guile-user module, so if you want to use definitions in expr, use

lilypond -e '(define-public a 42)'

on the command-line, and include

#(use-modules (guile-user))

at the top of the .ly file.

Note: Windows users must use double quotes instead of single quotes.

-f, --format=format

which formats should be written. Choices for format are ps, pdf, and png.

Example: lilypond -fpng filename.ly

-h, --help

Show a summary of usage.

-H, --header=FIELD

Dump a header field to file ‘BASENAME.FIELD’.

-i, --init=file

Set init file to file (default: ‘init.ly’).

-I, --include=directory

Add directory to the search path for input files.

Multiple -I options may be given. The search will start in the first defined directory, and if the file to be included is not found the search will continue in subsequent directories.

-j, --jail=user,group,jail,dir

Run lilypond in a chroot jail.

The ‘--jail’ option provides a more flexible alternative to ‘-dsafe’, when LilyPond formatting is being provided via a web server, or whenever LilyPond executes commands sent by external sources (see Advanced command line options for LilyPond).

It works by changing the root of lilypond to jail just before starting the actual compilation process. The user and group are then changed to match those provided, and the current directory is changed to dir. This setup guarantees that it is not possible (at least in theory) to escape from the jail. Note that for ‘--jail’ to work, lilypond must be run as root, which is usually accomplished in a safe way using sudo.

Setting up a jail can be a relatively complex matter, as we must be sure that LilyPond is able to find whatever it needs to compile the source inside the jail itself. A typical chroot jail will comprise the following steps:

Setting up a separate filesystem

A separate filesystem should be created for LilyPond, so that it can be mounted with safe options such as noexec, nodev, and nosuid. In this way, it is impossible to run executables or to write directly to a device from LilyPond. If you do not want to create a separate partition, just create a file of reasonable size and use it to mount a loop device. A separate filesystem also guarantees that LilyPond cannot write more space than it is allowed.

Setting up a separate user

A separate user and group (say, lily/lily) with low privileges should be used to run LilyPond inside the jail. There should be a single directory writable by this user, which should be passed in dir.

Preparing the jail

LilyPond needs to read a number of files while running. All these files are to be copied into the jail, under the same path they appear in the real root filesystem. The entire content of the LilyPond installation (e.g., ‘/usr/share/lilypond’) should be copied.

If problems arise, the simplest way to trace them down is to run LilyPond using strace, which will allow you to determine which files are missing.

Running LilyPond

In a jail mounted with noexec it is impossible to execute any external program. Therefore LilyPond must be run with a backend that does not require any such program. As we have already mentioned, it must be run with superuser privileges (which, of course, it will lose immediately), possibly using sudo. It is also good practice to limit the number of seconds of CPU time LilyPond can use (e.g., using ulimit -t), and, if your operating system supports it, the amount of memory that can be allocated. Also see LilyPond in chroot jail.

-l, --loglevel=LEVEL

Set the verbosity of the console output to LEVEL. Possible values are:

NONE

No output at all, not even error messages.

ERROR

Only error messages, no warnings or progress messages.

WARN

Warnings and error messages, no progress.

BASIC_PROGRESS

Basic progress messages (success), warnings and errors.

PROGRESS

All progress messages, warnings and errors.

INFO (default)

Progress messages, warnings, errors and further execution information.

DEBUG

All possible messages, including verbose debug output.

-o, --output=FILE or FOLDER

Set the default output file to FILE or, if a folder with that name exists, direct the output to FOLDER, taking the file name from the input file. The appropriate suffix will be added (e.g. .pdf for pdf) in both cases.

--ps

Generate PostScript.

--png

Generate pictures of each page, in PNG format. This implies ‘--ps’. The resolution in DPI of the image may be set with

-dresolution=110
--pdf

Generate PDF. This implies ‘--ps’.

-v, --version

Show version information.

-V, --verbose

Be verbose: show full paths of all files read, and give timing information.

-w, --warranty

Show the warranty with which GNU LilyPond comes. (It comes with NO WARRANTY!)


Advanced command line options for LilyPond

-d[option-name]=[value],--define-default=[option-name]=[value]

This sets the equivalent internal Scheme function to value.

-dbackend=svg

If a value is not supplied, then the default value is used. The prefix no- may be added to option-name to switch ‘off’ an option, e.g.

-dpoint-and-click=#f

is the same as

-dno-point-and-click

The following are supported along with their respective default values:

SymbolValueExplanation/Options
anti-alias-factor1Render at higher resolution (using given factor) and scale down result to prevent ‘jaggies’ in PNG images.
aux-files#tCreate .tex, .texi, .count files in the EPS backend.
backendpsSelect backend. Postscript files (default) include TTF, Type1 and OTF fonts. No subsetting of these fonts is done. Using ‘oriental’ character sets can lead to very large files.
epsEncapsulated PostScript. This dumps every page (system) as a separate ‘EPS’ file, without fonts, and as one collated ‘EPS’ file with all pages (systems) including fonts. Used as default by lilypond-book.
nullDo not output a printed score; has the same effect as -dno-print-pages.
svgScalable Vector Graphics. This creates a single SVG file, without embedded fonts, for every page of output. It is recommended to install the Century Schoolbook fonts, included with your LilyPond installation, for optimal rendering. Under UNIX, simply copy these fonts from the LilyPond directory (typically ‘/usr/share/lilypond/VERSION/fonts/otf/’) to ‘~/.fonts/’. There is also an option svg-woff (below) for use of woff font files in the SVG backend.
scmDump of the raw, internal Scheme-based drawing commands.
check-internal-types#fCheck every property assignment for types.
clip-systems#fGenerate cut-out snippets of a score.
datadirPrefix for data files (read-only).
debug-gc#fDump memory debugging statistics.
debug-gc-assert-parsed-dead#fFor memory debugging: Ensure that all references to parsed objects are dead. This is an internal option, and is switched on automatically for `-ddebug-gc'.
debug-lexer#fDebug the flex lexer.
debug-page-breaking-scoring#fDump scores for many different page breaking configurations.
debug-parser#fDebug the bison parser.
debug-property-callbacks#fDebug cyclic callback chains.
debug-skylines#fDebug skylines.
delete-intermediate-files#tDelete the unusable, intermediate .ps files created during compilation.
dump-cpu-profile#fDump timing information (system-dependent).
dump-profile#fDump memory and time information for each file.
dump-signatures#fDump output signatures of each system. Used for regression testing.
eps-box-padding#fPad left edge of the output EPS bounding box by the given amount (in mm).
gs-load-fonts#fLoad fonts via Ghostscript.
gs-load-lily-fonts#fLoad only the LilyPond fonts via Ghostscript.
gui#fRuns silently and redirect all output to a log file.

Note to Windows users: By default lilypond.exe outputs all progress information to the command window, lilypond-windows.exe does not and returns a prompt, with no progress information, immediately at the command line. The ‘-dgui’ option can be used in this case to redirect output to a log file.

help#fShow this help.
include-book-title-preview#tInclude book titles in preview images.
include-eps-fonts#tInclude fonts in separate-system EPS files.
include-settings#fInclude file for global settings, this is included before the score is processed.
job-count#fProcess in parallel, using the given number of jobs.
log-file#f [file]If string FOO is given as a second argument, redirect output to the log file FOO.log.
max-markup-depth1024Maximum depth for the markup tree. If a markup has more levels, assume it will not terminate on its own, print a warning and return a null markup instead.
midi-extension"midi"Set the default file extension for MIDI output file to given string.
music-strings-to-paths#fConvert text strings to paths when glyphs belong to a music font.
paper-size\"a4\"Set default paper size. Note the string must be enclosed in escaped double quotes.
pixmap-formatpng16mSet GhostScript’s output format for pixel images.
point-and-click#tAdd ‘point & click’ links to PDF and SVG output. See Point and click.
preview#fCreate preview images in addition to normal output.

This option is supported by all backends; pdf, png, ps, eps and svg, but not scm. It generates an output file, in the form myFile.preview.extension, containing the titles and the first system of music. If \book or \bookpart blocks are used, the titles of \book, \bookpart or \score will appear in the output, including the first system of every \score block if the \paper variable print-all-headers is set to #t.

To suppress the usual output, use the ‘-dprint-pages’ or ‘-dno-print-pages’ options according to your requirements.

print-pages#tGenerate full pages, the default. ‘-dno-print-pages’ is useful in combination with ‘-dpreview’.
profile-property-accesses#fKeep statistics of get_property() function calls.
protected-scheme-parsing#tContinue when errors in inline scheme are caught in the parser. If set to #f, halt on errors and print a stack trace.
read-file-list#f [file]Specify name of a file which contains a list of input files to be processed.
relative-includes#fWhen processing an \include command, look for the included file relative to the current file (instead of the root file).
resolution101Set resolution for generating PNG pixmaps to given value (in dpi).
safe#fDo not trust the .ly input.

When LilyPond formatting is available through a web server, either the ‘--safe’ or the ‘--jail’ option MUST be passed. The ‘--safe’ option will prevent inline Scheme code from wreaking havoc, e.g,

#(s ystem "rm -rf /")  % too dangerous to write correctly
{
  c4^$(ly:gulp-file "/etc/passwd") % malicious but not destructive
}

The ‘-dsafe’ option works by evaluating in-line Scheme expressions in a special safe module. This is derived from GUILE ‘safe-r5rs’ module, but also adds a number of functions of the LilyPond API which are listed in ‘scm/safe-lily.scm’.

In addition, safe mode disallows \include directives and disables the use of backslashes in TeX strings. It is also not possible to import LilyPond variables into Scheme while in safe mode.

-dsafe’ does not detect resource overuse, so it is still possible to make the program hang indefinitely, for example by feeding cyclic data structures into the backend. Therefore, if using LilyPond on a publicly accessible webserver, the process should be limited in both CPU and memory usage.

Safe mode will prevent many useful LilyPond snippets from being compiled.

The ‘--jail’ is an even more secure alternative, but requires more work to set up. See Basic command line options for LilyPond.

separate-log-files#fFor input files FILE1.ly, FILE2.ly, etc. output log data to files FILE1.log, FILE2.log
show-available-fonts#fList available font names.
strict-infinity-checking#fForce a crash on encountering Inf and NaN floating point exceptions.
strip-output-dir#tDon’t use directories from input files while constructing output file names.
strokeadjust#fForce PostScript stroke adjustment. This option is mostly relevant when a PDF is generated from PostScript output (stroke adjustment is usually enabled automatically for low-resolution bitmap devices). Without this option, PDF previewers tend to produce widely inconsistent stem widths at resolutions typical for screen display. The option does not noticeably affect print quality and causes large file size increases in PDF files.
svg-woff#fUse woff font files in SVG backend.
trace-memory-frequency#fRecord Scheme cell usage this many times per second. Dump the results to FILE.stacks and FILE.graph.
trace-scheme-coverage#fRecord coverage of Scheme files in FILE.cov.
verbose#fVerbose output, i.e. loglevel at DEBUG (read-only).
warning-as-error#fChange all warning and ‘programming error’ messages into errors.

Environment variables

lilypond recognizes the following environment variables:

LILYPOND_DATADIR

This specifies a directory where locale messages and data files will be looked up by default. The directory should contain subdirectories called ‘ly/’, ‘ps/’, ‘tex/’, etc.

LANG

This selects the language for the warning messages.

LILYPOND_LOGLEVEL

The default loglevel. If LilyPond is called without an explicit loglevel (i.e. no ‘--loglevel’ command line option), this value is used.

LILYPOND_GC_YIELD

A variable, as a percentage, that tunes memory management behavior. A higher values means the program uses more memory, a smaller value means more CPU time is used. The default value is 70.


LilyPond in chroot jail

Setting up the server to run LilyPond in a chroot jail is a complicated task. The steps are listed below. Examples in the steps are from Ubuntu GNU/Linux, and may require the use of sudo as appropriate.

Example script for 32-bit Ubuntu 8.04

#!/bin/sh
## defaults set here

username=lily
home=/home
loopdevice=/dev/loop0
jaildir=/mnt/lilyloop
# the prefix (without the leading slash!)
lilyprefix=usr/local
# the directory where lilypond is installed on the system
lilydir=/$lilyprefix/lilypond/

userhome=$home/$username
loopfile=$userhome/loopfile
adduser $username
dd if=/dev/zero of=$loopfile bs=1k count=200000
mkdir $jaildir
losetup $loopdevice $loopfile
mkfs -t ext3 $loopdevice 200000
mount -t ext3 $loopdevice $jaildir
mkdir $jaildir/lilyhome
chown $username $jaildir/lilyhome
cd $jaildir

mkdir -p bin usr/bin usr/share usr/lib usr/share/fonts $lilyprefix tmp
chmod a+w tmp

cp -r -L $lilydir $lilyprefix
cp -L /bin/sh /bin/rm bin
cp -L /usr/bin/convert /usr/bin/gs usr/bin
cp -L /usr/share/fonts/truetype usr/share/fonts

# Now the library copying magic
for i in "$lilydir/usr/bin/lilypond" "$lilydir/usr/bin/guile" "/bin/sh"  \
  "/bin/rm" "/usr/bin/gs" "/usr/bin/convert"; do ldd $i | sed 's/.*=>  \
    \/\(.*\/\)\([^(]*\).*/mkdir -p \1 \&\& cp -L \/\1\2 \1\2/' | sed  \
      's/\t\/\(.*\/\)\(.*\) (.*)$/mkdir -p \1 \&\& cp -L \/\1\2 \1\2/'  \
        | sed '/.*=>.*/d'; done | sh -s

# The shared files for ghostscript...
      cp -L -r /usr/share/ghostscript usr/share
# The shared files for ImageMagick
      cp -L -r /usr/lib/ImageMagick* usr/lib

### Now, assuming that you have test.ly in /mnt/lilyloop/lilyhome,
### you should be able to run:
### Note that /$lilyprefix/bin/lilypond is a script, which sets the
### LD_LIBRARY_PATH - this is crucial
      /$lilyprefix/bin/lilypond -jlily,lily,/mnt/lilyloop,/lilyhome test.ly

Footnotes

[1] The status of GUILE is not reset after processing a .ly file, so be careful not to change any system defaults from within Scheme.


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LilyPond — Usage v2.19.4 (development-branch).