usr.bin: 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/

service(8): use an environment more consistent with init(8)

init(8) sets the "daemon" login class without specifying a pw
entry (so no substitutions are done on the variables). service(8)'s
use of env -L had the effect of specifying root's pw entry, with two
effects: getpwnam and getpwuid are being called, which may not be
entirely safe depending on what nsswitch is up to and what stage of
boot we are at, and substitutions would have been done.

Fix by teaching env(8) to allow -L -/classname to set the class
environment with no pw entry at all specified, and use it in
service(8).

PR: 253959

Document in the synopsis that -0 cannot be used with the utility argument

Fix invalid use of macros and two typos

It turns out that currently mandoc(1) is not handling Fl in Ss
correctly (maybe it never was). Let's just replace "Fl S \&Ss ..."
with "-S ...". After all, this subsection title is stylized anyway, so Fl
is not that helpful.

MFC after: 2 weeks

env(1): grow -L user/class and -U user/class options

This allows one to set the environment of the specified user either from
login.conf alone (-L) or both login.conf and ~/.login_conf if present (-U).

This is a supporting feature to allow service(8) to pull in the environment
of the "daemon" class before invoking the rc script.

This is a part of D21481.

Submitted by: Andrew Gierth < andrew_tao173.riddles.org.uk>

Add -0 option to ENV(1)

With the -0 option added to ENV(1), some ports will no longer require genv
from sysutils/coreutils.

Reviewed by: kevans (prior version), swills
Approved by: bcr (manpages), imp
Differential Revision: https://reviews.freebsd.org/D22230

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

Escape Ss to avoid confusion by mdoc parser with the Ss macro

Reported by: make manlint
MFC after: 2 days

Remove the advertising clause from UCB copyrighted files in usr.bin. This
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

Also add $FreeBSD$ to a few files to keep svn happy.

Discussed with: imp, rwatson

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.

Update the date on the man-page to reflect the date that the '-u name'
change was committed, instead of when I had first started writing it...

Add the '-u name' option to the env command, which will completely unset
the given variable name (removing it from the environment, instead of
just setting it to a null value).

PR: bin/65649
MFC after: 2 weeks

Tidy up the markup.

Approved by: re (blanket)
OK'ed by: gad

Put in a more descriptive heading for the `env' command.

Noticed by: Matthew D Fuller
Approved by: re (blanket `env')

Undo r1.14 to env.c. While it is unusual for environment variables to
start with a '/', they are more supported (by POSIX and SUSv3) than
filenames which have an '=' in them.

Noticed by: tjr
Approved by: re (blanket `env')

Add the '-S' and '-P' options. The '-S' option can be used to split
apart a string, and supports some text substitutions. This can be
used to provide all the flexibility (and more!) that was lost by recent
changes to how the kernel parses #!-lines in shell scripts.

The '-P' option provides a way to specify an alternate set of directories
to use when searching for the 'utility' program to run. This way you can
be sure what directories are used for that search, without changing the
value of PATH that the user has set. Note that on FreeBSD 6.0, this
option is worthless unless the '-S' option is also used.

Approved by: re (blanket `env')

Added the EXIT STATUS section where appropriate.

Language and markup polishing.

Fix grammar bogon.

Removed (after the env(1)/printenv(1) split) extraneous arguments
to the .Nm macro.

Split the env(1) manpage off from printenv(1); there is not much point
in keeping them together. Mention that printenv is obsolescent.