GNU Info

(latex.info)\newcommand

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Enter node , (file) or (file)node

\newcommand
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      \newcommand{cmd}[args]{definition}
      \newcommand{cmd}[args][default]{definition}
      \renewcommand{cmd}[args]{definition}
      \renewcommand{cmd}[args][default]{definition}

   These commands define (or redefine) a command.

`cmd'
     A command name beginning with a `\'.  For `\newcommand' it must
     not be already defined and must not begin with `\end'; for
     `\renewcommand' it must already be defined.

`args'
     An integer from 1 to 9 denoting the number of arguments of the
     command being defined.  The default is for the command to have no
     arguments.

`def'
     If this optional parameter is present, it means that the command's
     first argument is optional. The default value of the optional
     argument is `def'.

`definition'
     The text to be substituted for every occurrence of `cmd'; a
     parameter of the form `#n' in `cmd' is replaced by the text of the
     nth argument when this substitution takes place.