I don't think plan 9 ever shipped with something like that. At least, my plan 9 systems don't have it: cpu% 9menu /fd/0:18: 9menu: './9menu' directory

I don't think plan 9 ever shipped with something like that. At least, my plan 9 systems don't have it: cpu% 9menu /fd/0:18: 9menu: './9menu' directory entry not found cpu% menu /fd/0:19: menu: './menu' directory entry not found There's bar(1), http://man.9front.org/1/bar http://man.9front.org/1/bar, but that was added in September 2022. Googling, it looks like you might be referring to the Linux/Unix utility https://github.com/arnoldrobbins/9menu https://github.com/arnoldrobbins/9menu.