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Remove old cruft, that make no sense at all on OpenBSD.
- comments relevant to other brands of UNIX
- the no-op KSH_VERSION case-block, we only have pdksh
- the case-block for setting aliases based on UNIX brand
  together with a comment that falsely encourages to modify this
  file instead of putting stuff in $HOME/.kshrc

OK krw@ halex@

:
#	$OpenBSD: ksh.kshrc,v 1.20 2015/02/18 08:39:32 rpe Exp $
#
# NAME:
#	ksh.kshrc - global initialization for ksh
#
# DESCRIPTION:
#	Each invocation of /bin/ksh processes the file pointed
#	to by $ENV (usually $HOME/.kshrc).
#	This file is intended as a global .kshrc file for the
#	Korn shell.  A user's $HOME/.kshrc file simply requires
#	the line:
#		. /etc/ksh.kshrc
#	at or near the start to pick up the defaults in this
#	file which can then be overridden as desired.
#
# SEE ALSO:
#	$HOME/.kshrc
#

# RCSid:
#	$From: ksh.kshrc,v 1.4 1992/12/05 13:14:48 sjg Exp $
#
#	@(#)Copyright (c) 1991 Simon J. Gerraty
#
#	This file is provided in the hope that it will
#	be of use.  There is absolutely NO WARRANTY.
#	Permission to copy, redistribute or otherwise
#	use this file is hereby granted provided that
#	the above copyright notice and this notice are
#	left intact.

case "$-" in
*i*)	# we are interactive
	# we may have su'ed so reset these
	USER=`whoami 2>/dev/null`
	USER=${USER:-`id | sed 's/^[^(]*(\([^)]*\)).*/\1/'`}
	UID=`id -u`
	case $UID in
	0) PS1S='# ';;
	esac
	PS1S=${PS1S:-'$ '}
	HOSTNAME=${HOSTNAME:-`uname -n`}
	HOST=${HOSTNAME%%.*}

	PROMPT="$USER:!$PS1S"
	#PROMPT="<$USER@$HOST:!>$PS1S"
	PPROMPT='$USER:$PWD:!'"$PS1S"
	#PPROMPT='<$USER@$HOST:$PWD:!>'"$PS1S"
	PS1=$PPROMPT
	# $TTY is the tty we logged in on,
	# $tty is that which we are in now (might by pty)
	tty=`tty`
	tty=`basename $tty`
	TTY=${TTY:-$tty}

	set -o emacs

	alias ls='ls -CF'
	alias h='fc -l | more'

	case "$TERM" in
	sun*-s)
		# sun console with status line
		if [ "$tty" != "$console" ]; then
			# ilabel
			ILS='\033]L'; ILE='\033\\'
			# window title bar
			WLS='\033]l'; WLE='\033\\'
		fi
		;;
	xterm*)
		ILS='\033]1;'; ILE='\007'
		WLS='\033]2;'; WLE='\007'
		parent="`ps -ax 2>/dev/null | grep $PPID | grep -v grep`"
		case "$parent" in
		*telnet*)
		export TERM=xterms;;
		esac
		;;
	*)	;;
	esac
	# do we want window decorations?
	if [ "$ILS" ]; then
		function ilabel { print -n "${ILS}$*${ILE}">/dev/tty; }
		function label { print -n "${WLS}$*${WLE}">/dev/tty; }

		alias stripe='label "$USER@$HOST ($tty) - $PWD"'
		alias istripe='ilabel "$USER@$HOST ($tty)"'

		# Run stuff through this to preserve the exit code
		function _ignore { local rc=$?; "$@"; return $rc; }

		function wftp { ilabel "ftp $*"; "ftp" "$@"; _ignore eval istripe; }

		function wcd     { \cd "$@";     _ignore eval stripe; }

		function wssh    { \ssh "$@";    _ignore eval 'istripe; stripe'; }
		function wtelnet { \telnet "$@"; _ignore eval 'istripe; stripe'; }
		function wrlogin { \rlogin "$@"; _ignore eval 'istripe; stripe'; }
		function wsu     { \su "$@";     _ignore eval 'istripe; stripe'; }

		alias su=wsu
		alias cd=wcd
		alias ftp=wftp
		alias ssh=wssh
		alias telnet=wtelnet
		alias rlogin=wrlogin
		eval stripe
		eval istripe
		PS1=$PROMPT
	fi
	alias quit=exit
	alias cls=clear
	alias logout=exit
	alias bye=exit
	alias p='ps -l'
	alias j=jobs
	alias o='fg %-'
	alias df='df -k'
	alias du='du -k'
	alias rsize='eval `resize`'
;;
*)	# non-interactive
;;
esac
# commands for both interactive and non-interactive shells

# is $1 missing from $2 (or PATH) ?
function no_path {
  eval _v="\$${2:-PATH}"
  case :$_v: in
  *:$1:*) return 1;;		# no we have it
  esac
  return 0
}
# if $1 exists and is not in path, append it
function add_path {
  [ -d ${1:-.} ] && no_path $* && eval ${2:-PATH}="\$${2:-PATH}:$1"
}
# if $1 exists and is not in path, prepend it
function pre_path {
  [ -d ${1:-.} ] && no_path $* && eval ${2:-PATH}="$1:\$${2:-PATH}"
}
# if $1 is in path, remove it
function del_path {
  no_path $* || eval ${2:-PATH}=`eval echo :'$'${2:-PATH}: |
    sed -e "s;:$1:;:;g" -e "s;^:;;" -e "s;:\$;;"`
}