4 ms·

Modifying /usr isn't THAT unusual.

• masklinn 11y ago
  The FHS defines /usr thus[0]: > /usr is shareable, read-only data. That means that /usr should be shareable between various FHS-compliant hosts and must not be written to. Pretty much all modern unices consider that /usr, aside from /usr/local (which the FHS defines as "for use by the system administrator when installing software locally. It needs to be safe from being overwritten when the system software is updated."[1]), is part of the operating system. It is thus very much unusual to modify /usr[2], and in line with current practices to lock it down tightly. /usr/local is not under SIP. [0] http://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch04.html#purpose18 http://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch04.html#pu... [1] http://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch04s09.html http://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch04s09.html [2] in fact the FHS specifically notes[3]: > Software placed in /usr may be overwritten by system upgrades. For this reason, local software must not be placed outside of /usr/local without good reason. "we specify that the system can overwrite or remove anything you put there" is pretty much a dead ringer for "modifying this is unusual" [3] http://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch04s09.html#ftn.idm236091898144 http://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch04s09.html...
  • bashinator 11y ago
    The FHS is, at best, only tangentially related to anything going on in a Mac OS X system.
• mnem 11y ago
  It's not everything under /usr. For example, I can install things to /usr/local/bin without issue.