Unless

Unless is a derivative of ~ATH.

Tutorial

The simplest possible Unless program

T:
    ;All unnecessary things

T

This can be changed into anything. If it exists, run the loop marked by it.
A tab (Or 4 spaces) is necessary for the start.
And, this is the main function. The program terminates after it.

R

Run something. (This can run anything)

N

It is nothing.
Example:
R:
    N

;

; is a one-line comment.

Functions

You can make a function.
Like this:
MYFUNCTION:
    R:
        functioncode.c
To call it, use it like this:
T:
    :MYFUNCTION
: is the calling command.

Objects

You can also make a class by this:
CLASS:
    FUN:
        R:
            myfunction.c
You can call it like this:
T:
    CLASS:FUN