Question: How can I introduce an abbreviation of derivatives?

I am very new to Maple. I would be very grateful if someone could teach me how to write a command in an Maple worksheet to do the following:

Let u(x) be a function of x.

How can I introduce an abbreviation of derivatives so u1x (or u_{1x}) is the first derivative of u(x) with respect to x, i.e., u1x=\partial u/\partial x; u2x (or u_{2x}) is the second derivative of u(x) with respect to x, i.e., u2x=\partial^2 u/\partial x^2; u3x (or u_{3x}) is the third derivative of u(x) with respect to x, i.e., u3x=\partial^3 u/\partial x^3; and in general unx (or u_{nx}) is the n-th derivative of u(x) with respect to x. i.e., unx=\partial^n u/\partial x^n

 u1x, u2x,…,unx can also be ux1, ux2,…,uxn if the later is easier to define.

 Thank you in advance.