\newcommand{\treeroot}[1]{% Title
  \node[above] at (0,0) {#1};%
  \setcounter{treeline}{0}
}


\newcommand{\treeentry}[2]{% Title, Level
  \draw[->] (#2-1,-\value{treeline}/2) -- (#2-1,-\value{treeline}/2-0.5) --
  (#2+0.5,-\value{treeline}/2-0.5) node[right] {#1};
  \stepcounter{treeline}
}

\newcommand{\altentry}[2]{% Title, Level
  \draw[->] (#2-1,-\value{treeline}/2) -- (#2-1,-\value{treeline}/2-0.5) --
  (#2+0.5,-\value{treeline}/2-0.5) node[right] {#1};
  \foreach \x in {1,...,#2}
  {   \draw (\x-1,-\value{treeline}/2) -- (\x-1,-\value{treeline}/2-0.5);
  }
  \stepcounter{treeline}
}

\newcommand{\shellcmd}[1]{\nopagebreak\hspace{1cm}\texttt{\footnotesize\$ #1}}