• from a MirOS point of view:

place most stuff from /etc/profile in /etc/skel/.mkshrc; admins must make
  sure to copy this file to users' homes on upgrade (benefit: non-login but
  interactive shells also get all the goodies); fix some quoting; simplify,
  reformat, change comments
• from an mksh point of view:
  slight internal changes in dot.mkshrc; external commands are now prefixed
  with “ulimit -c 0”; $TERM is defined; improvement in determining the host
  name (e.g. on Debian if a FQDN is not given); declare locals as such both
  in $PS1 and outside; remove superfluous quoting, quote properly; simplify
  hd alias, add rot13 alias; place RCS ID at the bottom

Makefile

@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/Makefile,v 1.35 2007/03/04 04:36:45 tg Exp $
+# $MirOS: src/bin/mksh/Makefile,v 1.36 2007/04/16 18:54:37 tg Exp $
 #-
 # use CPPFLAGS=-DDEBUG __CRAZY=Yes to check for certain more stuff
 
@@ -48,4 +48,8 @@ cleandir: clean-extra
 clean-extra: .PHONY
 	-rm -rf build-dir regress-dir
 
+distribution:
+	${INSTALL} ${INSTALL_COPY} -o ${BINOWN} -g ${CONFGRP} -m 0644 \
+	    ${.CURDIR}/dot.mkshrc ${DESTDIR}/etc/skel/.mkshrc
+
 .include <bsd.prog.mk>

dot.mkshrc

@@ -1,30 +1,34 @@
-# $MirOS: src/bin/mksh/dot.mkshrc,v 1.8 2007/03/04 06:20:48 tg Exp $
-
-: ${EDITOR:=/bin/ed} ${HOSTNAME:=$(hostname -s 2>/dev/null || hostname)}
-PS1='$(((rv=$?)) && print $rv\|)${USER:=$(id -un)}@${HOSTNAME:=nil}:$(
-	local pfx=~ wd=${PWD:-$(pwd)}
+: ${EDITOR:=/bin/ed} ${TERM:=vt100}
+[[ ${HOSTNAME:=$(ulimit -c 0; hostname -s 2>/dev/null)} = \
+    @(localhost|*([ 	])) ]] && HOSTNAME=$(ulimit -c 0; hostname 2>/dev/null)
+if [[ $(ulimit -c 0; id -u 2>/dev/null) -eq 0 ]]; then
+	PS1='# '
+else
+	PS1='$ '
+fi; PS1='$(integer rv=$?; ((rv)) && print -n $rv\|)${USER:=$(ulimit -c 0; \
+    id -un 2>/dev/null || print -n nobody)}@${HOSTNAME:=nil}:$(
+	local pfx=~ wd=${PWD:-$(builtin pwd)}; integer n=${COLUMNS:-80}/3
 	[[ ${wd#$pfx} = $wd || $pfx = ?(/) ]] || wd=\~${wd#$pfx}
-	pfx=; let n="( (n = ${COLUMNS:-80} / 3) < 7 ? 7 : n)"
+	pfx=; let n="n < 7 ? 7 : n"
 	while (( (${#pfx} + ${#wd}) > n )); do
 		if [[ $wd = */* ]]; then
 			pfx=.../
-			wd="${wd#*/}"
+			wd=${wd#*/}
 		else
 			pfx=...
-			wd="${wd#?????}"
+			wd=${wd#?????}
 		fi
 	done
-	print -r -- "$pfx$wd")'" $(if (( $(id -u) )); then
-		print \$; else print \#; fi) "
-export EDITOR HOSTNAME MKSH=$(whence -p mksh) PS1 USER
+	print -nr -- "$pfx$wd") '$PS1
+export EDITOR HOSTNAME MKSH="$(whence -p mksh)" PS1 TERM USER
 
 alias l='/bin/ls -F'
 alias la='l -a'
 alias ll='l -l'
 alias lo='la -lo'
-[ -x /usr/bin/hd ] || eval alias hd="'hexdump -e '\\''\"%08.8_ax  \" 8/1" \
-	'"%02X " " - " 8/1 "%02X "'"'\\'' -e '\\''"'"  |" "%_p"'"'\\''" \
-	"-e '\\''"'"|\n"'"'\\'' '"
+whence -p rot13 >/dev/null || alias rot13='tr [A-Za-z] [N-ZA-Mn-za-m]'
+whence -p hd >/dev/null || alias hd="hexdump -e '"'"%08.8_ax  " 8/1 '\
+'"%02X " " - " 8/1 "%02X "'"' -e '\"  |\" \"%_p\"' -e '\"|\\n\"'"
 
 # strip comments (and leading/trailing whitespace if IFS is set) from
 # any file(s) given as argument, or stdin if none, and spew to stdout
@@ -36,6 +40,6 @@ function Lstripcom
 	done; }
 }
 
-# Your shell code goes below!
+# place customisations between this line and the ": RCSID" line below
 
-: Your shell code goes above!
+: $MirOS: src/bin/mksh/dot.mkshrc,v 1.9 2007/04/16 18:54:37 tg Exp $