Miscellaneous LaTeX commands

\frac{}{}                    
\makebox[size][pos]{text}
\multicolumn{noc}{fmt}{text} 
\newcommand{\cs}[narg]{def}    
\newcounter{counter}[name]   
\newenvironment{envname}[narg]{def1}{def2}
\newtheorem{env}[env2]{label}[sectype] 
\raisebox{dim}[d2][d3]{text}
\renewcommand{\cs}[narg]{def} 
\renewenvironment{envname}[narg]{def1}{def2}
\rule[height]{length}{width}
\savebox{\binname}[width][pos]{text}
\sbox{\binname}{text}
\setlength{\nl}{length}
\settowidth{\nl}{text}
\shortstack[pos]{x\\y}
\sqrt[]{}
\stackrel{stuff}{delim}
\typein[\cs]{text}    
\typeout{}
\usebox{\binname}
\verb||