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```OMEGA(1)                                                              OMEGA(1)

NAME
omega, iniomega, viromega - extended unicode TeX

SYNOPSIS
omega [options] [& format ] [ file | \ commands ]

DESCRIPTION
Run  the  Omega  typesetter  on file, usually creating file.dvi.  If the file argument has no extension, ".tex"
will be appended to it.  Instead of a filename, a set of Omega commands can be given, the first of  which  must
start  with a backslash.  With a &format argument Omega uses a different set of precompiled commands, contained
in format.fmt; it is usually better to use the -fmt format option instead.

Omega is a version of the TeX program modified for multilingual typesetting.  It uses unicode,  and  has  addi-
tional primitives for (among other things) bidirectional typesetting.

The  iniomega and viromega commands are Omega's analogues to the initex and virtex commands.  In this installa-
tion, they are symlinks to the omega executable.

Omega's command line options are similar to those of TeX.

Omega is experimental software.

OPTIONS
This version of Omega understands the following command line options.

--oft format
Use format as the name of the format to be used, instead of the name by which Omega was called or  a  %&
line.

-halt-on-error
Exit with an error code when an error is encountered during processing.

--help Print help message and exit.

--ini  Be iniomega, for dumping formats; this is implicitly true if the program is called as iniomega.

--interaction mode
Sets  the  interaction  mode.  The mode can be one of batchmode, nonstopmode, scrollmode, and errorstop-
mode.  The meaning of these modes is the same as that of the corresponding \commands.

--ipc  Send DVI output to a socket as well as the usual output file.  Whether this option is available  is  the
choice of the installer.

--ipc-start
As  --ipc,  and  starts  the  server  at the other end as well.  Whether this option is available is the
choice of the installer.

Sets path searching debugging flags according to the bitmask.  See the Kpathsea manual for details.

--maketex fmt
Enable mktexfmt, where fmt must be one of tex or tfm.

--no-maketex fmt
Disable mktexfmt, where fmt must be one of tex or tfm.

--output-comment string
Use string for the DVI file comment instead of the date.

-output-directory directory
directory instead of the current directory.  Look up input files in directory first, the along the  nor-
mal search path.

--parse-first-line
If the first line of the main input file begins with %& parse it to look for a dump name.

--progname name
Pretend to be program name.  This affects both the format used and the search paths.

--recorder
Enable  the  filename  recorder.  This leaves a trace of the files opened for input and output in a file
with extension .ofl.  (This option is always on.)

--shell-escape
Enable the \write18{command} construct.  The command can be any Bourne shell command.  This construct is
normally disallowed for security reasons.

--version
Print version information and exit.

ENVIRONMENT
See the Kpathsearch library documentation (the 'Path specifications' node) for precise details of how the envi-
ronment variables are used.  The kpsewhich utility can be used to query the values of the variables.

One caveat: In most Omega formats, you cannot use ~ in a filename you give directly to Omega, because ~  is  an
active  character, and hence is expanded, not taken as part of the filename.  Other programs, such as Metafont,
do not have this problem.

TEXMFOUTPUT
Normally, Omega puts its output files in the current directory.  If any output  file  cannot  be  opened
there, it tries to open it in the directory specified in the environment variable TEXMFOUTPUT.  There is
no default value for that variable.  For example, if you say tex paper and the current directory is  not
writable,   if   TEXMFOUTPUT   has  the  value  /tmp,  Omega  attempts  to  create  /tmp/paper.log  (and
/tmp/paper.dvi, if any output is produced.)

TEXINPUTS
Search path for \input and \openin files.  This should probably start with ''.'', so that user files are
found  before  system  files.   An  empty  path component will be replaced with the paths defined in the
texmf.cnf file.  For example, set TEXINPUTS to ".:/home/usr/tex:" to prepend the  current  direcory  and
''/home/user/tex'' to the standard search path.

TEXEDIT
Command template for switching to editor.  The default, usually vi, is set when Omega is compiled.

FILES
The  location  of  the  files  mentioned below varies from system to system.  Use the kpsewhich utility to find
their locations.

omega.pool
Encoded text of Omega's messages.

*.oft  Predigested Omega format (.oft) files.

NOTES
This manual page is not meant to be exhaustive.  The complete documentation for this version of  Omega  can  be
found in the info manual Web2C: A TeX implementation.

BUGS
This  version  of Omega implements a number of optional extensions.  In fact, many of these extensions conflict
to a greater or lesser extent with the definition of Omega.  When  such  extensions  are  enabled,  the  banner
printed when Omega starts is changed to print Omegak instead of Omega.

This  version  of Omega fails to trap arithmetic overflow when dimensions are added or subtracted.  Cases where
this occurs are rare, but when it does the generated DVI file will be invalid.

The DVI files produced by Omega may use extensions which make them incompatible with most software designed  to
handle DVI files.  In order to print or preview them, you should use odvips to generate a PostScript file.

Omega  is experimental software, and if you are an active user it is strongly recommended that you subscribe to
the Omega mailing list.  Visit the Omega website http://omega.cse.unsw.edu.au for information on  how  to  sub-
scribe.