Creating a new tmux session or attaching to an existing one with WSL

The default “Command Line” argument for the WSL profile looks like this:

C:\WINDOWS\system32\wsl.exe -d Ubuntu

Append this to create a new tmux session or attach to an existing one:

tmux attach || tmux new

So that it looks like this:

C:\WINDOWS\system32\wsl.exe -d Ubuntu tmux attach || tmux new

From this Stack Overflow answer.