Date: Sat, 17 Aug 2019 09:16:43 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net> To: Ian Lepore <ian@freebsd.org> Cc: Gordon Bergling <gbergling@gmail.com>, freebsd-hackers@freebsd.org Subject: Re: uname -a default options Message-ID: <201908171616.x7HGGhpK036345@gndrsh.dnsmgr.net> In-Reply-To: <7d1f88943c0b744920d7181df51b76675d145f18.camel@freebsd.org>
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> On Sat, 2019-08-17 at 15:08 +0200, Gordon Bergling wrote: > > Hello List, > > > > "uname -a" is currently mapping the -a option to ?-mnrsv?, which > > results in something similar like > > > > $ uname -a > > FreeBSD lion.0xfce3.net <http://lion.0xfce3.net/>; 12.0-STABLE FreeBSD > > 12.0-STABLE r350835 GENERIC amd64 > > > > What would you think about reducing the option mapping for ?-a? to ?- > > vmn? , which would result in a less repetitive version string like > > the one below. > > > > $ uname -vmn > > lion.0xfce3.net <http://lion.0xfce3.net/>; FreeBSD 12.0-STABLE r350835 > > GENERIC amd64 > > > > Adapting this would be trivial, but before I hack something together, > > I would like to get some feedback if such a change would be welcomed? > > > > Best regards, > > > > Gordon > > > > I think there are likely very many existing scripts in the world that > parse the output of uname -a and would break if the fields moved around > or disappeared. I agree that we should not change the output of uname -a, for one it is a POSIX spec'ed command, though I would not expect scripts to be parsing the output of -a, they should actually invoke the more specific item(s) they need and parse those, a much less error prone methods. I would however like to note that Linux (or atleast Ubuntu 19.04) has a man page that -a says "All of the below" and are infact returning more info than the Posix man page which says -a is -mnrsv rgrimes@mgmt:~$ uname -a Linux mgmt 5.1.0-rc2+ #14 SMP Sun Aug 4 09:23:12 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux rgrimes@mgmt:~$ man uname rgrimes@mgmt:~$ uname -mnrsv Linux mgmt 5.1.0-rc2+ #14 SMP Sun Aug 4 09:23:12 UTC 2019 x86_64 rgrimes@mgmt:~$ uname -m x86_64 rgrimes@mgmt:~$ uname -n mgmt rgrimes@mgmt:~$ uname -r 5.1.0-rc2+ rgrimes@mgmt:~$ uname -s Linux rgrimes@mgmt:~$ uname -v #14 SMP Sun Aug 4 09:23:12 UTC 2019 FreeBSD: root {1003}# uname -a FreeBSD w530a.dnsmgr.net 12.0-RELEASE FreeBSD 12.0-RELEASE r341666 GENERIC amd64 root {1004}# uname -m amd64 root {1005}# uname -n w530a.dnsmgr.net root {1006}# uname -r 12.0-RELEASE root {1007}# uname -s FreeBSD root {1008}# uname -v FreeBSD 12.0-RELEASE r341666 GENERIC So it is really our -v string that is full of redundant data that MAY want to be evaluated for trimming. -- Rod Grimes rgrimes@freebsd.org
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