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Use an ISC-tyle license for all my code; it is simpler and more permissive.

#!/bin/ksh -
#
# $OpenBSD: spell.ksh,v 1.5 2003/06/03 01:52:41 millert Exp $
#
# Copyright (c) 2001 Todd C. Miller <Todd.Miller@courtesan.com>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
# WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
# FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
# OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
SPELLPROG=/usr/libexec/spellprog
DICT=/usr/share/dict/words
LOCAL_DICT=/usr/local/share/dict/words
STOP=/usr/share/dict/stop
LOCAL_STOP=/usr/local/share/dict/stop
AMERICAN=/usr/share/dict/american
BRITISH=/usr/share/dict/british
LANG=$AMERICAN
STOP_LANG=$BRITISH
EXTRA=
FLAGS=
DEROFF="deroff -w"
HISTFILE=
TMP=`mktemp /tmp/spell.XXXXXXXX` || exit 1
VTMP=
USAGE="usage: spell [-biltvx] [-d list] [-h spellhist] [-s stop] [+extra_list] [file ...]"

trap "rm -f $TMP $VTMP; exit 0" 0

# Use local word/stop lists if they exist
if [ -f $LOCAL_DICT ]; then
	DICT="$DICT $LOCAL_DICT"
fi
if [ -f $LOCAL_STOP ]; then
	STOP="$STOP $LOCAL_STOP"
fi

# getopts will treat +foo the same as -foo so we have to make a copy
# of the args and quit the loop when we find something starting with '+'
set -A argv $0 "$@"
while test "${argv[$OPTIND]#+}" = "${argv[$OPTIND]}" && \
    getopts "biltvxd:h:m:s:" c; do
	case $c in
	b)	LANG=$BRITISH
		STOP_LANG=$AMERICAN
		FLAGS[${#FLAGS[@]}]="-b"
		;;
	i)	DEROFF="$DEROFF -i"
		;;
	l)	DEROFF="delatex"
		;;
	m)	DEROFF="$DEROFF -m $OPTARG"
		;;
	t)	DEROFF="detex"
		;;
	v)	VTMP=`mktemp /tmp/spell.XXXXXXXX` || {
			rm -f ${TMP}
			exit 1
		}
		FLAGS[${#FLAGS[@]}]="-v"
		FLAGS[${#FLAGS[@]}]="-o"
		FLAGS[${#FLAGS[@]}]="$VTMP"
		;;
	x)	FLAGS[${#FLAGS[@]}]="-x"
		;;
	d)	DICT="$OPTARG"
		LANG=
		;;
	s)	STOP="$OPTARG"
		STOP_LANG=
		LOCAL_STOP=
		;;
	h)	HISTFILE="$OPTARG"
		;;
	*)	echo "$USAGE" 1>&2
		exit 1
		;;
	esac
done
shift $(( $OPTIND - 1 ))

while test $# -ne 0; do
	case "$1" in
		+*)	EXTRA="$EXTRA ${1#+}"
			shift
			;;
		*)	break
			;;
	esac
done

# Any parameters left are files to be checked, pass them to deroff
DEROFF="$DEROFF $@"

if [ -n "$HISTFILE" ]; then
	$DEROFF | sort -u | $SPELLPROG -o $TMP $STOP $STOP_LANG | \
	    $SPELLPROG ${FLAGS[*]} $DICT $LANG $EXTRA | sort -u -k1f - $TMP | \
	    tee -a $HISTFILE
	who -m >> $HISTFILE
else
	$DEROFF | sort -u | $SPELLPROG -o $TMP $STOP $STOP_LANG | \
	    $SPELLPROG ${FLAGS[*]} $DICT $LANG $EXTRA | sort -u -k1f - $TMP
fi

if [ -n "$VTMP" ]; then
	sort -u -k2f -k1 $VTMP
fi

exit 0