Andrew Libby on 24 Jan 2006 14:34:00 -0000 |
Greetings Art, When I first began learning Unix/ Linux I too was told that /usr/local is the place for my local customizations. I'd put scripts out there, build my local software from /usr/local/src, and have it's --prefix=/usr/local. Along the way I've done some work as a Solaris admin where optional software packages are installed in /opt. My approach was to link /usr/local and /opt together on my systems. Indeed, even in Linux many packages now install in /opt. I believe vmware may be this way (or is that only on gentoo due to the approach of ebuild authors)? Someone then pointed out to me that /usr/local and /usr/share were intended to be local and nfs exported filesystems. I don't know how true this is, but based on the names, that makes sense. I recall a standard on this that I once read. Searching yielded this page http://www.pathname.com/fhs/. The FHS talks about both /opt and /usr/local. 3.13. /opt : Add-on application software packages 3.13.1. Purpose /opt is reserved for the installation of add-on application software packages. A package to be installed in /opt must locate its static files in a separate /opt/<package> or /opt/<provider> directory tree, where <package> is a name that describes the software package and <provider> is the provider's LANANA registered name. 4.8.2. /usr/local : Local hierarchy 4.8.2.1. Purpose The /usr/local hierarchy is for use by the system administrator when installing software locally. It needs to be safe from being overwritten when the system software is updated. It may be used for programs and data that are shareable amongst a group of hosts, but not found in /usr. Locally installed software must be placed within /usr/local rather than /usr unless it is being installed to replace or upgrade software in /usr. 7 It's almost worded like ISV packages are intended to be installed in OPT, while build from source packages are intended for /usr/local. I may be reading into this too much. Neither of these make reference to sharing out with something like NFS. The sections for /usr/share seem to. IMO, coherent and consistent file system layout and management is a key to good systems administration. Perhaps this could be a talk someone gives at some point. It'd be interesting to see a survey of distributions and their support of this (or competing) standard. Other folks have thoughts? Andy Art Alexion wrote: >I have been led to believe that the /usr/local branch is where packages >that aren't part of a distro should be installed. I put custom scripts >in /usr/local/bin for that reason. > >But I have also been told that's the purpose of the /opt branch. > >What is the difference between these two and when should one use which? > > > >------------------------------------------------------------------------ > >___________________________________________________________________________ >Philadelphia Linux Users Group -- http://www.phillylinux.org >Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce >General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug > > -- Andrew Libby alibby@philadelphiariders.com http://philadelphiariders.com/ Motorcycle Enthusiasm, Fishtown Style 1999 SV650 1999 Laverda 750S 1996 BMWR1100RS 1981 Moto Guzzi CX100 (in Lemans I clothing) ___________________________________________________________________________ Philadelphia Linux Users Group -- http://www.phillylinux.org Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug
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