\newenvironment
\newenvironment{nam}[args]{begdef}{enddef}
\renewenvironment{nam}[args]{begdef}{enddef}
These commands define or redefine an environment.
- nam The name of the environment. For
\newenvironment there must be no currently defined
environment by that name, nor may the command \nam
be currently defined. For \renewenvironment the
environment "nam" must already be defined.
nam may contain letters, numbers, and asterisks; it
may not begin with "end...".
- args An integer from 1 to 9 denoting the number
of arguments of the newly-defined environment. The default
is no arguments.
- begdef The text substituted for every occurrence
of \begin{nam}; a parameter of the form #n
in begdef is replaced by the text of the nth
argument when this substitution takes place.
- enddef The text substituted for every occurrence
of \end{nam}. It may not contain any argument parameters.
It is possible to have an optional argument, the form of the
command being
\newenvironment{nam}[args][opt]{begdef}{enddef}
\renewenvironment{nam}[args][opt]{begdef}{enddef}
If opt is present, the first of the args
arguments is optional with default value opt. If it is
absent all arguments are mandatory.
See also Defining commands,
Environments