Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Fix spurious error from sysrc

When using sysrc to modify a file, the file should be created silently.
However, with the introduction of SVN r335280, an error of "No such file
or directory" would app

Fix spurious error from sysrc

When using sysrc to modify a file, the file should be created silently.
However, with the introduction of SVN r335280, an error of "No such file
or directory" would appear despite everything else working as-expected.

The nature of this spurious error is that SVN r335280 did not check if
the file exists first, before trying to fixup the line-endings in the
file just prior to modification.

PR: bin/240875
Reported by: Jose Luis Duran
MFC after: 3 days

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sysrc.subr: Fix a comment for accuracy

PR: bin/203435
Reported by: Andreas Sommer <andreas.sommer87@googlemail.com>
MFC after: 6 days
X-MFC-to: stable/11
X-MFC-with: r335280
Sponsored by: Smule, In

sysrc.subr: Fix a comment for accuracy

PR: bin/203435
Reported by: Andreas Sommer <andreas.sommer87@googlemail.com>
MFC after: 6 days
X-MFC-to: stable/11
X-MFC-with: r335280
Sponsored by: Smule, Inc.

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sysrc.subr: Fix display when value is "-n"

PR: bin/226406
Reported by: Marius Halden <marius.halden@modirum.com>
MFC after: 1 week
X-MFC-to: stable/11
Sponsored by: Smule, Inc.

sysrc.subr: Fix handling of files with missing newline at EOF

PR: bin/203435
Reported by: Andreas Sommer <andreas.sommer87@googlemail.com>
MFC after: 1 week
X-MFC-to: stable/11
Sponsored by: Smule,

sysrc.subr: Fix handling of files with missing newline at EOF

PR: bin/203435
Reported by: Andreas Sommer <andreas.sommer87@googlemail.com>
MFC after: 1 week
X-MFC-to: stable/11
Sponsored by: Smule, Inc.

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Merge ^/head r307383 through r307735.

Guard against bad service name argument(s) to load_rc_config()

MFC after: 3 days
X-MFC-to: stable/11 stable/10

MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

Catch up with head (r291075).

Add support for "rc.conf.d" file(s).

Differential Revision: https://reviews.freebsd.org/D3551
Reviewed by: allanjude
MFC after: 1 week
X-MFC-to: stable/10
X-MFC-with: 290337
Relnotes: yes

Merge head

IFC @264767

Merge head up to r262222 (last merge was incomplete).

MFC @ r259205 in preparation for some SVM updates. (for real this time)

Performance and debugging enhancements:
+ Remove UNAME_P=$(...) from startup/misc -- already supplied by common.subr
+ Use f_getvar instead of $(eval echo \$$var) -- f_getvar is sub-shell free
+ Add

Performance and debugging enhancements:
+ Remove UNAME_P=$(...) from startup/misc -- already supplied by common.subr
+ Use f_getvar instead of $(eval echo \$$var) -- f_getvar is sub-shell free
+ Add `-e' and `-k var' options to f_eval_catch -- increasing use-cases
+ Use f_eval_catch to display errors on failure -- reducing duplicated code
+ Use f_eval_catch when we need output from a command -- improving debugging
+ Optimize f_isinter of strings.subr for performance -- now sub-shell free
+ Improve error checking on pidfiles -- using f_eval_catch and f_isinteger
+ Use $var_to_set arg of f_ifconfig_{inet,netmask} -- eliminate sub-shells
+ Use f_sprintf instead of $(printf ...) -- consolidate sub-shells
+ Use $var_to_set arg of f_route_get_default -- eliminate sub-shells
+ Add f_count to replace $(set -- ...;echo $#) -- eliminate sub-shells
+ Add f_count_ifs to replace $(IFS=x;set -- ...;echo $#) -- no sub-shells
+ Replace var="$var${var:+ }..." in loops with var="$var ..." with a follow-
up var="${var# }" to trim leading whitespace -- optimize loops
+ Use $var_to_set arg of f_resolv_conf_nameservers -- eliminate sub-shells
+ Comments for the f_eval_catch function
+ Remove a duplicate `local ... desc ...' in f_device_get_all of device.subr
+ Use $var_to_set arg of f_device_capacity -- eliminate sub-shells
+ Whitespace fixes in f_dialog_init of dialog.subr
+ Optimize f_inet_atoi of media/tcpip.subr for performance -- sub-shell free
+ In several cases, send stderr to /dev/null -- clean up runtime execution
+ Change f_err of common.subr to go to program stderr not terminal stderr,
allowing redirection of output from functions that use f_err
+ Disable debugging when using f_getvar to get variable argument to
f_startup_rcconf_map_expand of startup/rcconf.subr
+ Use f_replace_all instead of $(echo ... | tr | sed) -- performance
+ Add a $var_to_set option to f_index_{file,menusel_{command,keyword}} of
common.subr -- centralize sub-shells

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Merge head up to r258343.

Comments.

Merge head r233826 through r256722.

Merge from head

IFC @ r254014

IFC @ r253461

IFC @253398

Fix typos in the BSD License.

Be consistent with other usr.sbin programs w/respect to the copyright
wording ("All rights reserved."); I had the casing wrong on many instances.

IFC @ r252288