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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

enable to set locate command

sync improvements from concatdb.sh

- stop on first error
- improve awk script: print the last two characters for bigram - not the second word
- remove unnecessary checks
- use mktemp
- refactor

limit sort(1) memory usage to 20% of available main memory

By default BSD sort(1) uses 90% (or at least 50%?) of the available
main memory. That is good for performance for a single job, but not
for a shared OS. For a long running script the performance is less
important than the stability of the server. Also, if a server
with 64GB RAM starts swapping, the performance goes south and
hurts other running applications.

Note: this change does not affect the weekly cron job to
rebuild the locate database. The FreeBSD locate.updatedb
use the -presort option (find -s)

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.

Correct syntax error, remove the unescaped newline between "||" and the
command it is intended to test. pdksh and bash caught this syntax error,
sh(1) did not behave as intended.

PR: 40386

Only got one of the Perl usages.

Replace a perl usage with an AWK one.

Submitted by: Bob Willcox <bob@immure.com>

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

$Id$ -> $FreeBSD$

Set TMPDIR to /tmp
Remove the temp directory in trap.
Replace the buggy awk script with a correct perl script.

Don't make a copy of the input data anymore if the input is already
sorted (option -presort). This scheme avoid large temporary files in
/tmp.

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.

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