Remove $FreeBSD$: two-line nroff pattern

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

Merge ^/head r306412 through r306905.

Document origins of expr & authors
http://minnie.tuhs.org/cgi-bin/utree.pl?file=PWB1/usr/man/man1/expr.1

PR: 173979
Approved by: bcr (mentor)
MFC after: 5 days
Differential Revision: https://review

Document origins of expr & authors
http://minnie.tuhs.org/cgi-bin/utree.pl?file=PWB1/usr/man/man1/expr.1

PR: 173979
Approved by: bcr (mentor)
MFC after: 5 days
Differential Revision: https://reviews.freebsd.org/D8104

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Catch up with HEAD (r280229-r284686).

Merge sync of head

Merge from head

MFH: r281855-r282312

Sponsored by: The FreeBSD Foundation

Pet manlint

Use mdoc(7) macros for curly braces

IFC @ r238370

Merge head r233826 through r236168.

MFC

Minor mdoc nits.

IFC @ r234692

sys/amd64/include/cpufunc.h
sys/amd64/include/fpu.h
sys/amd64/amd64/fpu.c
sys/amd64/vmm/vmm.c

- Add API to allow vmm FPU state init/save/restore.

FP stuff discussed with: kib

Merge head up to r232685 to projects/pf/head.

Whitespace cleanup:
o Wrap sentences on to new lines
o Cleanup trailing whitespace

Found with: textproc/igor
MFC after: 1 week
X-MFC-With: r232157

Fix various typos in manual pages.

Submitted by: amdmi3
PR: 165431
MFC after: 1 week

IFC @ r224187

Integrate from Head into ZFSD feature branch as of revision r224141.

Make /bin/expr support 64bit numeric range and range checks by default,
again. This brings back the behaviour of expr in FreeBSD-4, which had been
reverted due to an assumed incompatbility with POSIX

Make /bin/expr support 64bit numeric range and range checks by default,
again. This brings back the behaviour of expr in FreeBSD-4, which had been
reverted due to an assumed incompatbility with POSIX.1 for FreeBSD-5.

This issue has been discussed in the freebsd-standards list, and the
consensus was, that POSIX.1 is in fact not violated by this extension,
since it affects only cases of POSIX undefined behaviour (overflow of
signed long).

Other operating systems did upgrade their versions of expr to support
64bit range, after it had been initially brought to FreeBSD. They have
used it for a decade without problems, meanwhile.

The -e option is retained, but it will only select less strict checking
of numeric parameters (leading white-space, leading "+" are allowed and
skipped, an empty string is considered to represent 0 in numeric context.)
The call of check_utility_compat() as a means of establishing backwards
compatibility with FreeBSD-4 is considered obsolete, but preserved in
this commit. It is expected to be removed in a later revision of this
file.
Reviewed by: bde, das, jilles
MFC after: 2 month (those parts that do not violate POLA)

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expr(1): Add sh(1) versions of examples, remove an incorrect example.

The three examples are better done using sh(1) itself these days.

The example
expr -- "$a" : ".*"
is incorrect in the general

expr(1): Add sh(1) versions of examples, remove an incorrect example.

The three examples are better done using sh(1) itself these days.

The example
expr -- "$a" : ".*"
is incorrect in the general case, as "$a" may be an operator.

MFC after: 2 weeks

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Fix markup.

Add the new standard EXIT STATUS section where appropriate.
Sort standard sections in the (documented) preferred order.

Removed harmful empty lines that crept in during the copyright
header update.

/*- or .\"- or #- to begin license clauses.