Thanks! I've always thought /usr/bin was for software later installed (due to its name "user slash binaries") and thought /usr/local/bin was useless. This actually makes more sense, gonna start installing programs to /usr/local/bin now.
Here is what the Unix manual from Bell Labs (the origin of Unix) says about /usr/bin versus /bin:
Commands generally reside in directory /bin
(for binary programs). Some programs also
reside in /usr/bin, to save space in /bin.
There were hardware limitations in the early days of Unix. Short command names (like “ls” and “rm”) were used to save memory and paper (teletypes were used in the days before video terminals). Each byte mattered back then. There must have been a constraint on how much they could put in /bin (I am guessing).
