On Thu 30 April 2015 10:12:30 Dr. Nikolaus Klepp wrote:
> From the FreeBSD point of view:
>
> https://www.freebsd.org/doc/en/books/handbook/dirstructure.html

and here is more (sorry to link to the obvious):
http://www.pathname.com/fhs/pub/fhs-2.3.html (possibly outdated, I didn't
check for a long time)

let me quote a quite old factoid of IRC infobot about what they did to /usr
and /opt in maemo:
<infobot> optification is a inventive duct tape workaround to reclaim space in
fs root, done due to the fact the systeminit *and* partitioning is FUBAR,
http://wiki.maemo.org/Documentation/Maemo_5_Developer_Guide/Packaging,_Deploying_and_Distributing/Installing_under_opt_and_MyDocs,
or ""OMG - I wish they looked into FHS and moved /usr to eMMC"",
http://www.pathname.com/fhs/pub/fhs-2.3.html#PURPOSE2 bullet1,2 and
fhs-2.3.html#PURPOSE16 dot3"

Maemo is also a nice example of a system that's absolutely incompatible with
that systemd avalanche

/j


>
> Anyway, symlinking /bin to /usr/bin is quite strange.
>
> Nik
>
> Am Donnerstag, 30. April 2015 schrieb James Powell:
> > From my personal knowledge, having built LFS a few times, though this
> > doesn't compare with other distributions as the purposes of /(root),
> > /usr, /opt, and /usr/local have changed over the years:
> >
> > /(root) is where boot-time software is to be installed that must be
> > readily available when the system is brought up and init is sent into
> > action.
> >
> > /usr is where admin system and networked system services are installed. In
> > Linux terms, just about all software is installed here including local
> > system applications and add-on software. in BSD terms, this is where all
> > administrative tools to the OS are installed that do not have the same
> > priority as those needed at boot-time in /(root).
> >
> > /usr/local is where user installed local packages are installed and ran
> > from. In Linux terms, this directory is rarely used nowadays, but is
> > still part of the FHS guidelines because you can use this directory. In
> > BSD terms any packages from the ports collection are installed here to
> > segregate user installed local applications and packages from the main
> > BSD system.
> >
> > /opt is where single purpose software that usually is self-contained, such
> > as LibreOffice, Mozilla Firefox, and specialized libraries like QT are
> > kept.
> >
> > /home was developed to separate non-root user accounts from /root and the
> > core of the system. Usually this is a separate partition usually using a
> > long term storage file system like BtrFS, ZFS, JFS, ReiserFS, etc.
> >
> > Now this may not be 100% accurate but it is a rough estimate of what these
> > were purposed for.
> >
> > I could be wrong... but I have been wrong from time to time.
> >
> > -Jim
> >
> > > Date: Thu, 30 Apr 2015 08:48:10 +0100
> > > From: katolaz@???
> > > To: reisenweber@???
> > > CC: dng@???
> > > Subject: Re: [Dng] [dng] vdev status updates
> > >
> > > On Thu, Apr 30, 2015 at 01:27:48AM +0200, Joerg Reisenweber wrote:
> > > > On Wed 29 April 2015 23:46:51 Didier Kryn wrote:
> > > > > They decided to put them on the second disk which contained user
> > > > > data
> > > > > and was therefore mounted at /usr
> > > >
> > > > AFAIK that's "Unix System Resources" or somesuch, not "User"
> > > > /j
> > >
> > > Well, in the first few versions of Research Unix (and I believe at
> > > least until Version 7, in 1979) /usr was the folder where user home
> > > directories lived. /home came much later, AFAIK...
> > >
> > > My2Cents
> > >
> > > KatolaZ