Fun fact: /usr exists because Thompson and Ritchie ran out of disk space on the root disk of their PDP-11 [1] in the early 1970s. /usr was originally where the

Fun fact: /usr exists because Thompson and Ritchie ran out of disk space on the root disk of their PDP-11 [1] in the early 1970s. /usr was originally where the user's files (everything but the OS) lived, but when they ran out of space they decided to just move OS stuff into it. The whole "/bin is available on boot until /usr is mounted" story, which a classic form of post-rationalization, though it was presumably a useful distinction for a while. [1] http://lists.busybox.net/pipermail/busybox/2010-December/074114.html http://lists.busybox.net/pipermail/busybox/2010-December/074...