executable_testtruecolor

 1#!/bin/bash
 2
 3# Print True color test strip
 4awk -v term_cols="${width:-$(tput cols || echo 80)}" 'BEGIN{
 5    s="  ";
 6    for (colnum = 0; colnum<term_cols; colnum++) {
 7        r = 255-(colnum*255/term_cols);
 8        g = (colnum*510/term_cols);
 9        b = (colnum*255/term_cols);
10        if (g>255) g = 510-g;
11        printf "\033[48;2;%d;%d;%dm", r,g,b;
12        printf "\033[38;2;%d;%d;%dm", 255-r,255-g,255-b;
13        printf "%s\033[0m", substr(s,colnum%2+1,1);
14    }
15    printf "\n";
16}'