gistfile1.tex

\documentclass{article}
\usepackage{tikz}

\makeatletter
\def\grd@save@target#1{%
  \def\grd@target{#1}}
\def\grd@save@start#1{%
  \def\grd@start{#1}}
\tikzset{
  simplegrid with coordinates/.style={
    to path={%
      \pgfextra{%
        \edef\grd@@target{(\tikztotarget)}%
        \tikz@scan@one@point\grd@save@target\grd@@target\relax
        \edef\grd@@start{(\tikztostart)}%
        \tikz@scan@one@point\grd@save@start\grd@@start\relax
        %% Extract coordinates
        \grd@start
        \pgfmathsetmacro{\grd@xa}{\the\pgf@x/1cm}
        \pgfmathsetmacro{\grd@ya}{\the\pgf@y/1cm}
        \grd@target
        \pgfmathsetmacro{\grd@xb}{\the\pgf@x/1cm}
        \pgfmathsetmacro{\grd@yb}{\the\pgf@y/1cm}
        %% Grid
        \draw (\tikztostart) grid (\tikztotarget);
        %% Axes
        \draw[black,thick] (\grd@xa, 0) -- (\grd@xb, 0) node[right] {};
        \draw[black,thick] (0, \grd@ya) -- (0, \grd@yb) node[above] {};
        %% Coordinates
        %% ( change to {\grd@xa,\grd@xc,...,\grd@xb} for stepping ).
        \foreach \x in {\grd@xa,...,\grd@xb}
          \node[anchor=north] at (\x,\grd@ya) {%
            \footnotesize{\pgfmathprintnumber{\x}}};
        \foreach \y in {\grd@ya,...,\grd@yb}
          \node[anchor=east] at (\grd@xa,\y) {%
            \footnotesize{\pgfmathprintnumber{\y}}};
      }
    }
  }
}
\makeatother


\begin{document}

\begin{tikzpicture}
\draw (0,0) to [simplegrid with coordinates] (6,6);
\end{tikzpicture}

\end{document}