assess your baseline.

There are a variety of technologies at play and each one needs to work end-to-end. The core of the debugging is an awk script termstandard/colors which will emit a color test (see example output below).

script.

'BEGIN {
    s="/\\/\\/\\/\\/\\"; s=s s s s s s s s;
    for (colnum = 0; colnum<77; colnum++) {
        r = 255-(colnum*255/76);
        g = (colnum*510/76);
        b = (colnum*255/76);
        if (g>255) g = 510-g;
        printf "\033[48;2;%d;%d;%dm", r,g,b;
        printf "\033[38;2;%d;%d;%dm", 255-r,255-g,255-b;
        printf "%s\033[0m", substr(s,colnum+1,1);
    }
printf "\n";
}'

example outputs.

correct output.

incorrect output.

Assert truecolor is working, using the above script, under:

1. The local shell, under the terminal emulator of choice. An even longer line that will wrap.
2. The remote shell, over SSH
3. The remote shell, over mosh
4. The remote shell, over mosh, inside of a tmux session
5. If needed: the local shell, inside of tmux

If you encounter an incorrect output, debugging

final setup.

software.

• Kitty v0.28.1
• mosh v1.4
  • For Ubuntu 22.04, mosh will need to be build from source. Download the .tar.gz and follow the instructions under Latest release.
• tmux v3.2a

configurations.

.tmux.conf

The only change required for tmux.

set-option -ga terminal-overrides ",xterm-256color:Tc"

.bashrc

More of an "unconfiguration," do not set $TERM in your bash shell.