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This is the BSDA Study Guide Book written via a wiki collaboration. This is a work in progress. You may contribute to or discuss this specific page at http://bsdwiki.reedmedia.net/wiki/Determine_information_regarding_the_operating_system.html. Determine information regarding the operating system Concept Be able to determine the type and version of the operating system installed. Introduction The uname command can display the type and version of the operating system installed, including the system's hostname, the release level, and the hardware platform name and the processor architecture name. The -a option will show many details, and is similar to calling uname with the "-m -n -r -s -v" options. Note that usually the kernel and userland (like libc, BSD tools and network daemons, et cetera) are kept in sync so the same version would apply for the operating system as a whole. TODO: is "sync" term okay here? Maybe improve sentence. And should this mention that uname is for kernel only? By default, it shows the name of the operating system: $ uname DragonFly $ uname -s DragonFly The machine's hardware name and processor architecture name can be displayed, respectively: $ uname -m i386 $ uname -p i386 TODO: add note and example about when -m and -p are different It can also provide the time and date of the built kernel, the host it was built on, and the path to the kernel configuration used, for example: $ uname -v DragonFly 1.7.0-DEVELOPMENT #0: Fri Oct 27 12:10:01 PDT 2006 jdoe@server5.example.org:/build/usr.obj/usr/src/sys/SERVER The sysctl tool (introduced in section Modify a kernel parameter on the fly) can also show some of this same information, for example: $ sysctl kern.ostype kern.ostype = NetBSD $ sysctl kern.hostname kern.hostname = glacier.reedmedia.net $ sysctl kern.osrelease kern.osrelease = 3.99.24 $ sysctl kern.version kern.version = NetBSD 3.99.24 (JCR20060802) #0: Mon Sep 25 12:22:43 CDT 2006 reed@new-host-8:/usr/src/sys/arch/i386/compile/JCR20060802 $ sysctl hw.machine hw.machine = i386 $ sysctl hw.machine_arch hw.machine_arch = i386 On NetBSD, an /etc/release file also gives further details to identify the source code used to build the system. Practice Exercises TODO More information uname(1), sysctl(8); /etc/release on NetBSD