dmesg(8): Fix typo timetamps -> timestamps

Event: Advanced UNIX Programming Course (Fall'23) at NTHU.
Pull Request: https://github.com/freebsd/freebsd-src/pull/1036

sbin: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

Remove $FreeBSD$: one-line nroff pattern

Remove /^\.\\"\s*\$FreeBSD\$$\n/

dmesg: Better wording from review

I pushed the last changes before I'd noticed the better wording
suggestions in the review. Also include a note that not all lines will
have a timestampe. Some multi-line messages are generated with sbuf, and
when those are pushed, only the first line will have the
timestamp. Document this quirky behavior as well since fixing it likely
won't happen soon. CAM periph drivers generate all the lines in their
announce message together so they aren't intermingled with other things,
for example.

Suggested by: allanjude, emaste, rpokala
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D35139
Differential Revision: https://reviews.freebsd.org/D35141

msgbuf: Allow microsecond granularity timestamps

Today, kern.msgbuf_show_timestamp=1 will give 1 second granularity
timestamps on dmesg lines. When kern.msgbuf_show_timestamp=2, we'll
produce microsecond level graunlarity.
For example:
old (== 1):
[13] Dual Console: Video Primary, Serial Secondary
[14] lo0: link state changed to UP
[15] bxe0: NIC Link is Up, 10000 Mbps full duplex, Flow control: ON - receive & transmit
[15] bxe0: link state changed to UP
new (== 2):
[13.807015] Dual Console: Video Primary, Serial Secondary
[14.544150] lo0: link state changed to UP
[15.272044] bxe0: NIC Link is Up, 10000 Mbps full duplex, Flow control: ON - receive & transmit
[15.272052] bxe0: link state changed to UP

Sponsored by: Netflix

dmesg: Document kern.msgbuf_show_timestamp

kern.msgbuf_show_timestamp=1 turns on timestamps in kernel's message
buffer which dmesg(8) prints.

Sponsored by: Netflix

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

dmesg(8) first appeared in 3BSD.
http://minnie.tuhs.org/cgi-bin/utree.pl?file=3BSD/usr/man/man1/dmesg.1m

PR: 212443
Approved by: bcr (mentor)
Obtained from: TUHS
MFC after: 4 days
Differential Revision: https://reviews.freebsd.org/D8105

Bump .Dd for recent content change.

Reported by: delphij

Add support for 'dmesg -c' which clears the dmesg buffer after it has
been printed. This provides compatibility with other *nix systems
(including Linux).

While here use stdbool booleans for 'all'.

PR: bin/178295
Submitted by: Levent Serinol <lserinol@gmail.com>
Reviewed by: will

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

Remove advertising clause from University of California Regent's license,
per letter dated July 22, 1999.

Approved by: core, imp

Not too much point specifying -N but not specifying -M.

s/filesystem/file system/g as discussed on -developers

The .Nm utility

mdoc(7) police: compute the exact tag width.

Add mention of /var/run/dmesg.boot.

Yes, this isn't really the right place for it. No, it really can't
remain undocumented.

mdoc(7) police: removed HISTORY info from the .Os call.

Update the dmesg man page to reflect the recent changes to dmesg.

Reviewed by: ru

Backout -a restriction hack.

Requested by: rwatson

Restrict -a to root only.

PR: bin/25337

Fix hard sentence break introduced in previous commit.

Add a -a option to show the entire message buffer.

mdoc(7) police: use the new features of the Nm macro.

Remove obsolete /dev/drum references

Reviewed by: alex, asmodai, billf

$Id$ -> $FreeBSD$

Use .Pa for filenames. Use .Bl/.El in FILES section. Remove unused #includes.

Add relevant files to the FILES section
Submitted by: Julian H Stacey

Converted 'vmunix' to 'kernel'.

BSD 4.4 Lite sbin Sources

Note: XNSrouted and routed NOT imported here, they shall be imported with
usr.sbin.