Remove $FreeBSD$: one-line sh pattern

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

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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mktemp: skip later TMPDIR check if -p is specified

We already did the necessary $TMPDIR fallback, if it's going to be used.
Skip the later check so that we don't accidentally override our -p
argumen

mktemp: skip later TMPDIR check if -p is specified

We already did the necessary $TMPDIR fallback, if it's going to be used.
Skip the later check so that we don't accidentally override our -p
argument.

Fixes: ac6f924e1c ("mktemp: add -p/--tmpdir argument")
Sponsored by: Klara, Inc.

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mktemp: don't double up on trailing slashes for -t paths

This is a minor cosmetic change; re-organize slightly to set tmpdir to
_PATH_TMP if we didn't otherwise have a tmpdir candidate, then check t

mktemp: don't double up on trailing slashes for -t paths

This is a minor cosmetic change; re-organize slightly to set tmpdir to
_PATH_TMP if we didn't otherwise have a tmpdir candidate, then check the
trailing char before appending another slash.

While we're here, remove some bogus whitespace and add a test case for
this change.

Obtained from: https://github.com/apple-oss-distributions/shell_cmds
Sponsored by: Klara, Inc.

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mktemp: add -p/--tmpdir argument

This matches other mktemp implementations, including OpenBSD and GNU.
The -p option can be used to provide a tmpdir prefix for specified
templates. Precedence works

mktemp: add -p/--tmpdir argument

This matches other mktemp implementations, including OpenBSD and GNU.
The -p option can be used to provide a tmpdir prefix for specified
templates. Precedence works out like so:

-t flag:
- $TMPDIR
- -p directory
- /tmp

Implied -t flag (no arguments or only -d flag):
- -p directory
- $TMPDIR
- /tmp

Some tests have been added for mktemp(1) in the process.

Reviewed by: imp (earlier version), wosch
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D37121

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