3.28 test

This command graphically tests or presents terminal and palette capabilities.

Syntax:

      test {terminal | palette [rgb|rbg|grb|gbr|brg|bgr]}

test or terminal creates a display of line and point styles and other useful things appropriate for and supported by the terminal you are just using.

palette draws graphically profiles R(z),G(z),B(z), where 0<=z<=1, as calculated by the current color palette. In other words, it is a beautiful plot you would have to construct from the result of ‘show palette palette 256 float‘. The optional parameter, a permutation of letters rgb, determines the sequence of r,g,b profiles drawn one after the other — try this yourself for ‘set palette gray‘. The default sequence is rgb.