One can learn a modicum about the differences among lbin, mbin, rbin, bin, 5bin, sbin, amdahl/bin, ucb, sun/bin, ccs/bin, local/bin, xpg4/bin, xpg6/bin, and som

One can learn a modicum about the differences among lbin, mbin, rbin, bin, 5bin, sbin, amdahl/bin, ucb, sun/bin, ccs/bin, local/bin, xpg4/bin, xpg6/bin, and some others at https://unix.stackexchange.com/a/448799/5132 https://unix.stackexchange.com/a/448799/5132 .