Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.unix.shell > #26880
| From | Keith Thompson <Keith.S.Thompson+u@gmail.com> |
|---|---|
| Newsgroups | comp.unix.shell |
| Subject | Re: ed |
| Date | 2026-06-10 16:43 -0700 |
| Organization | None to speak of |
| Message-ID | <110csrb$13aa9$2@kst.eternal-september.org> (permalink) |
| References | <slrn112c9fb.2pa2.zaydm@new.localdomain> <1108b56$b00$1@nntp.sonologic.net> <1109qej$2vlaa$1@dont-email.me> <110abmr$ckmk$12@dont-email.me> <110cmrj$32trj$1@dont-email.me> |
John McCue <jmclnx@gmail.com.invalid> writes:
> Lawrence D?Oliveiro <ldo@nz.invalid> wrote:
>> On Tue, 9 Jun 2026 19:44:19 -0000 (UTC), John McCue wrote:
>>
>>> There is one use for ed(1), when I boot NetBSD into single user
>>> mode, ed(1) is the only one available without jumping through hoops.
>>
>> Why is that? Is it because NetBSD still has the legacy root-versus-usr
>> separation of executables and libraries?
>
> From what I have seen, seems Linux does not have a real single
> user mode. But I think that is OK for Linux.
>
> NetBSD and the other BSDs have real single user mode where no
> file systems are mounted, no daemons are started and root is
> mounted RO. NetBSD boots into /bin/sh or a shell of your
> choice and you work from that, no login needed. Also I think
> only static executables are available for use.
>
> I do not know what "legacy root-versus-usr" means, I would
> never want a system that does not have a clear separation
> between root and users.
That's not what it means.
Historically, /bin and /usr/bin were two different directories,
with /bin containing only executables that are needed during
system startup. /usr/bin can be on a separate filesystem that isn't
initially mounted. I think /usr was also where home directories were
located; for example, Dennis Ritchie's home directory was /usr/dmr.
I think the origin of that is an early PDP-11 or PDP-7 system at
Bell Labs that had limited space on its main hard drive a larger
secondary drive.
NetBSD 10.1, the latest release, retains that distinction. I have
it running in a VM, and it has 39 files in /bin and 515 in /usr/bin.
All the executables are dynamically linked, but I think they
depend on on libraries in /lib, not /usr/lib. /bin and /usr/bin
are on the same filesystem (though I think it can be configured
with /usr in its own filesystem).
Many other Unix-like systems have transitioned to making /bin a
symbolic link to /usr/bin. But remnants of the old layout still
exist; for example /usr/bin and /bin are typically both in $PATH
even if they're the same directory.
Similar things apply to /lib and /usr/bin, and to /sbin and
/usr/sbin.
--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */
Back to comp.unix.shell | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
ed __ ___ ________ ____ ______. Zayd Mohammed <zaydm@172.24.208.1> - 2026-06-08 02:16 +0000
Re: ed __ ___ ________ ____ ______. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-06-08 04:46 +0200
Re: ed __ ___ ________ ____ ______. cross@spitfire.i.gajendra.net (Dan Cross) - 2026-06-08 13:44 +0000
Re: ed __ ___ ________ ____ ______. gazelle@shell.xmission.com (Kenny McCormack) - 2026-06-08 14:12 +0000
Re: ed. cross@spitfire.i.gajendra.net (Dan Cross) - 2026-06-08 19:30 +0000
Re: ed __ ___ ________ ____ ______. Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-06-08 14:40 -0700
Re: ed __ ___ ________ ____ ______. groenveld@acm.org (John D Groenveld) - 2026-06-09 00:04 +0000
Re: ed __ ___ ________ ____ ______. Adam Sampson <ats@offog.org> - 2026-06-09 01:50 +0100
Re: ed __ ___ ________ ____ ______. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-06-09 16:47 +0200
Re: ed __ ___ ________ ____ ______. Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-06-09 16:41 -0700
Re: ed __ ___ ________ ____ ______. Ben Collver <bencollver@tilde.pink> - 2026-06-09 14:27 +0000
Re: ed __ ___ ________ ____ ______. Eric Pozharski <apple.universe@posteo.net> - 2026-06-08 22:28 +0000
Re: ed __ ___ ________ ____ ______. Lumin Etherlight <lumin+usenet@etherlight.link> - 2026-06-09 03:25 +0300
Re: ed __ ___ ________ ____ ______. Daniel Cerqueira <dan.list@lispclub.com> - 2026-06-09 09:47 +0100
Re: ed __ ___ ________ ____ ______. Joerg Mertens <joerg-mertens@t-online.de> - 2026-06-09 15:53 +0200
Re: ed __ ___ ________ ____ ______. Daniel Cerqueira <dan.list@lispclub.com> - 2026-06-09 21:00 +0100
Re: ed __ ___ ________ ____ ______. Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-06-09 16:29 -0700
Re: ed __ ___ ________ ____ ______. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-06-11 08:39 +0200
Re: ed __ ___ ________ ____ ______. Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-06-11 13:40 -0700
Re: ed __ ___ ________ ____ ______. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-06-12 16:56 +0200
Re: ed __ ___ ________ ____ ______. Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-06-12 15:22 -0700
Re: ed __ ___ ________ ____ ______. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-06-13 00:58 +0200
Re: ed __ ___ ________ ____ ______. Daniel Cerqueira <dan.list@lispclub.com> - 2026-07-03 00:55 +0100
Re: ed Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-07-03 00:47 +0000
Re: ed John McCue <jmclnx@gmail.com.invalid> - 2026-07-03 01:32 +0000
Re: ed Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-07-03 04:11 +0000
Re: ed Nuno Silva <nunojsilva@invalid.invalid> - 2026-07-03 07:57 +0100
Re: ed Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-07-03 09:32 +0200
Re: ed __ ___ ________ ____ ______. Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-02 20:30 -0700
Re: ed __ ___ ________ ____ ______. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-06-09 17:57 +0200
Re: ed __ ___ ________ ____ ______. John McCue <jmclnx@gmail.com.invalid> - 2026-06-08 22:57 +0000
Re: ed __ ___ ________ ____ ______. Lumin Etherlight <lumin+usenet@etherlight.link> - 2026-06-09 03:02 +0300
Re: ed __ ___ ________ ____ ______. gmc@metro.cx (Koen Martens) - 2026-06-09 06:17 +0000
Re: ed __ ___ ________ ____ ______. Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-09 06:55 +0000
Re: ed __ ___ ________ ____ ______. John McCue <jmclnx@gmail.com.invalid> - 2026-06-09 19:44 +0000
Re: ed __ ___ ________ ____ ______. Top Dead Ctr <tdc@invalid.invalid> - 2026-06-09 14:09 -0600
Re: ed __ ___ ________ ____ ______. Christian Weisgerber <naddy@mips.inka.de> - 2026-06-09 23:52 +0000
Re: ed Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-10 00:40 +0000
Re: ed Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-10 00:38 +0000
Re: ed John McCue <jmclnx@gmail.com.invalid> - 2026-06-10 22:01 +0000
Re: ed Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-06-10 16:43 -0700
Re: ed Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-06-10 16:50 -0700
Re: ed cross@spitfire.i.gajendra.net (Dan Cross) - 2026-06-10 23:53 +0000
Re: ed Eli the Bearded <*@eli.users.panix.com> - 2026-06-11 00:12 +0000
Re: ed Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-11 00:55 +0000
Re: ed cross@spitfire.i.gajendra.net (Dan Cross) - 2026-06-11 02:00 +0000
Re: ed Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-06-10 19:30 -0700
Re: ed cross@spitfire.i.gajendra.net (Dan Cross) - 2026-06-11 11:31 +0000
Re: ed Christian Weisgerber <naddy@mips.inka.de> - 2026-06-11 15:02 +0000
Re: ed Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-06-11 08:46 +0200
Re: ed John McCue <jmclnx@gmail.com.invalid> - 2026-06-11 14:28 +0000
Re: ed cross@spitfire.i.gajendra.net (Dan Cross) - 2026-06-10 23:48 +0000
Re: ed Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2026-06-11 00:24 +0000
Re: ed John McCue <jmclnx@gmail.com.invalid> - 2026-06-11 14:11 +0000
Re: ed Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-12 00:22 +0000
Re: ed Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-11 00:53 +0000
Re: ed Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-06-11 09:02 +0200
Re: ed __ ___ ________ ____ ______. Nuno Silva <nunojsilva@invalid.invalid> - 2026-06-10 11:03 +0100
Re: ed __ ___ ________ ____ ______. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-06-11 09:12 +0200
Re: ed __ ___ ________ ____ ______. Nuno Silva <nunojsilva@invalid.invalid> - 2026-06-12 09:44 +0100
Android editor (Was: ed __ ___ ________ ____ ______.) gazelle@shell.xmission.com (Kenny McCormack) - 2026-06-12 09:03 +0000
Re: Android editor Nuno Silva <nunojsilva@invalid.invalid> - 2026-06-12 12:01 +0100
csiph-web