remove references to hardcoded /usr/local/plan9 where possible

diff --git "a/bin/\"" "b/bin/\""
index d7f7ad2..da94c3e 100755
--- "a/bin/\""
+++ "b/bin/\""

@@ -1,4 +1,4 @@
-#!/usr/local/plan9/bin/rc
+#!/usr/bin/env $PLAN9/bin/rc
 
 fn text {
 	if(~ $winid [0-9]*)

diff --git "a/bin/\"\"" "b/bin/\"\""
index ac5cda8..9a6d5a5 100755
--- "a/bin/\"\""
+++ "b/bin/\"\""

@@ -1,4 +1,4 @@
-#!/usr/local/plan9/bin/rc
+#!/usr/bin/env $PLAN9/bin/rc
 
 PROMPT='[^ 	]*[%;$#][ 	]+'
 

diff --git a/bin/Getdir b/bin/Getdir
index 5b83917..d7b8ae1 100755
--- a/bin/Getdir
+++ b/bin/Getdir

@@ -1,4 +1,4 @@
-#!/usr/local/plan9/bin/rc
+#!/usr/bin/env $PLAN9/bin/rc
 
 # Click on an acme directory window and then execute Getdir
 

diff --git a/bin/adict b/bin/adict
index 2d8156d..74d710e 100755
--- a/bin/adict
+++ b/bin/adict

@@ -1,4 +1,4 @@
-#!/usr/local/plan9/bin/rc
+#!/usr/bin/env $PLAN9/bin/rc
 
 . $PLAN9/lib/acme.rc
 

diff --git a/bin/doctype b/bin/doctype
index df72db8..3d720b8 100755
--- a/bin/doctype
+++ b/bin/doctype

@@ -1,4 +1,4 @@
-#!/usr/local/plan9/bin/rc
+#!/usr/bin/env $PLAN9/bin/rc
 # doctype:  synthesize proper command line for troff
 
 troff=troff

diff --git a/bin/g b/bin/g
index c9e8b92..b50b519 100755
--- a/bin/g
+++ b/bin/g

@@ -1,19 +1,37 @@
-#!/usr/local/plan9/bin/rc
+#!/bin/sh
 
-flags=()
-while(! ~ $#* 1 && ~ $1 -*){
-	flags=($flags $1)
-	shift
-}
+inflags=yes
+flags=""
+while [ $# != 0 -a $inflags = yes ]
+do
+	case "$1" in
+	-*)
+		flags="$flags $1"
+		shift
+		;;
+	-)
+		inflags=no
+		shift
+		;;
+	*)
+		inflags=no
+		;;
+	esac
+done
 
-switch($#*){
-case 0
-	echo 'usage: g [flags] pattern [files]' >[1=2]
+case $# in
+0)
+	echo 1>&2 'usage: g [flags] pattern [files]'
 	exit 1
-case 1
-	9grep -n $flags -- $1 *.[Cbchm] *.cc *.py *.tex *.ms *.java /dev/null \
-	  |[2] {9grep -v '^(grep: can''t open \*|grep: \*\.)' >[1=2]; status=0}
-case *
-	9grep -n $flags -- $* /dev/null
-}
+	;;
+1)
+	pattern="$1"
+	files=`/bin/ls *.[bcChm] *.cc *.py *.tex *.ms *.java 2>/dev/null`
+	;;
+*)
+	pattern="$1"
+	shift
+	files="$@"
+esac
 
+exec grep -n $flags -- "$pattern" $files /dev/null

diff --git a/bin/lookman b/bin/lookman
index 57e8d3c..12223be 100755
--- a/bin/lookman
+++ b/bin/lookman

@@ -1,7 +1,7 @@
-#!/usr/local/plan9/bin/rc
+#!/usr/bin/env $PLAN9/bin/rc
 # Usage: lookman key ...
 #	prints out the names of all manual pages containing all the given keywords
-index=/usr/local/plan9/man/lookman.index
+index=$PLAN9/man/lookman.index
 t1=/tmp/look1.$pid
 t2=/tmp/look2.$pid
 fn sigexit sigint sighup sigterm{
@@ -24,7 +24,7 @@
 			' > $t2
 	mv $t2 $t1
 }
-sort $t1 | sed 's;/usr/local/plan9/man/man[0-9]*/;;
+sort $t1 | sed 's;/.*/man/man[0-9]*/;;
 	s;(.*)\.(.*);man \2 \1 # \1(\2);'
 rm -f $t1 $t2
 exit 0

diff --git a/bin/spell b/bin/spell
index 3a6b4a3..f09538b 100755
--- a/bin/spell
+++ b/bin/spell

@@ -1,4 +1,4 @@
-#!/usr/local/plan9/bin/rc
+#!/usr/bin/env $PLAN9/bin/rc
 
 spellflags=()
 deroffargs=()

diff --git a/bin/src b/bin/src
index 046417a..ffacc5e 100755
--- a/bin/src
+++ b/bin/src

@@ -1,4 +1,4 @@
-#!/usr/local/plan9/bin/rc
+#!/usr/bin/env $PLAN9/bin/rc
 
 sym = 'threadmain?z
 	p9main?z

diff --git a/bin/start b/bin/start
index 147f387..e45a9fa 100755
--- a/bin/start
+++ b/bin/start

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-exec /usr/local/plan9/bin/kill -CONT "$@"
+exec $PLAN9/bin/kill -CONT "$@"

diff --git a/bin/stop b/bin/stop
index cbafb9d..b54a1bd 100755
--- a/bin/stop
+++ b/bin/stop

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-exec /usr/local/plan9/bin/kill -STOP "$@"
+exec $PLAN9/bin/kill -STOP "$@"