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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

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

refactor script

- simpler usage of mktemp(1)
- remove unnecessary checks
- documentation

awk: print the last two characters for bigram - not the second word

A bigram may contain a space character, and we always need two characters.

stop on first error

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

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.

Use mktemp(1) for tempfiles (concatdb.sh), and increase the number of X's.

$Id$ -> $FreeBSD$

Change default temporary directory (TMPDIR) from /tmp to /var/tmp.

Mosts users seems to have a larger /var/tmp partition
than /tmp - IMHO silly but who cares?

Improve shell variable substitution.

Allow TMPDIR to be set and actually *used*; if it not set, it defaults
to /tmp.

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

add forgotten variable $locate

sync copyright with /usr/share/examples/etc/bsd-style-copyright

bigram
Bigram does not remove newline at end of filename. This
break particulary the bigram algorithm and /var/db/locate.database
grow up 15 %.

Bigram does not check for characters outside 32-127.

The bigram output is silly and need ~1/2 CPU time of
database rebuilding.

old:
locate.bigram < $filelist | sort | uniq -c | sort -nr
^^^^^^^^^^^^^^
this can easy made bigram

new:
bigram < $filelist | sort -nr

code
Code does not check for char 31.
Use a lookup array instead a function. 3 x faster.

updatedb
rewritten
sync with bigram changes

read config file /etc/locate.rc if exists
submitted by: guido@gvr.win.tue.nl (Guido van Rooij)

concatdb - concatenate locate databases
mklocatedb - build locate database