Convert the point $( 1, -1, -6 )$ in rectangular coordinates to cylindrical coordinates.  Enter your answer in the form $(r,\theta,z),$ where $r > 0$ and $0 \le \theta < 2 \pi.$
We have that $r = \sqrt{1^2 + (-1)^2} = \sqrt{2}.$  We want $\theta$ to satisfy
\begin{align*}
1 &= \sqrt{2} \cos \theta, \\
-1&= \sqrt{2} \sin \theta.
\end{align*}Thus, $\theta = \frac{7 \pi}{4},$ so the cylindrical coordinates are $\boxed{\left( \sqrt{2}, \frac{7 \pi}{4}, -6 \right)}.$