--help displays a usage message, while -v and --version show
version information; all exit afterward.
-C Recognize .EQ and .EN even when followed by a character
other than space or newline, and do not handle the 'delim
on' statement specially.
-d xy Specify delimiters x and y for the left and right ends,
respectively, of inline equations. Any delim statements
in the source file override this.
-f F This is equivalent to a 'gfont F' command.
-m n Set the minimum point size to n. eqn will not reduce the
size of subscripts or superscripts to a smaller size
than n.
-M dir Search dir for eqnrc before the default directories.
-N Don't allow newlines within delimiters. This option
allows eqn to recover better from missing closing
delimiters.
-p n This says that subscripts and superscripts should be
n points smaller than the surrounding text. This option
is deprecated. Normally, eqn sets subscripts and
superscripts at 70% of the size of the surrounding text.
-r Only one size reduction.
-R Don't load eqnrc.
-s n This is equivalent to a 'gsize n' command. This option is
deprecated. eqn normally sets equations at whatever the
current point size is when the equation is encountered.
-T name
The output is for output driver name. Normally, the only
effect of this is to define a macro name with a value
of 1; eqnrc uses this to provide definitions appropriate
for the output driver. However, if the specified driver
is 'MathML', the output is MathML markup rather than troff
commands, and eqnrc is not loaded at all. The default
output driver is ps.
