kill, slay, broke: dont pollute environment, use $user

rc/bin/broke

@@ -1,8 +1,8 @@
 #!/bin/rc
-U=`{cat /dev/user}
+rfork e
 if(~ $#* 1){
-	U=$1
+	user=$1
 }
-ps | sed -n '/^'$U' .* Broken/s%[^ ]*  *%~>/proc/%
+ps | sed -n '/^'$user' .* Broken/s%[^ ]*  *%~>/proc/%
 s%  *.* (.*)%/ctl # \1%
 s%~%echo kill%p'

rc/bin/kill

@@ -1,8 +1,7 @@
 #!/bin/rc
 rfork e
-U=`{cat /dev/user}
 for(i){
-	ps | sed -n '/^'$U' .* '$i'$/s%[^ ]*  *%~>/proc/%
+	ps | sed -n '/^'$user' .* '$i'$/s%[^ ]*  *%~>/proc/%
 	s%  *.* (.*)%/note} # \1%
 	s%~%@{echo kill%p'
 }

rc/bin/slay

@@ -1,7 +1,7 @@
 #!/bin/rc
-U=`{cat /dev/user}
+rfork e
 for(i){
-	ps | sed -n '/^'$U' .* '$i'$/s%[^ ]*  *%~>/proc/%
+	ps | sed -n '/^'$user' .* '$i'$/s%[^ ]*  *%~>/proc/%
 	s%  *.* (.*)%/ctl} # \1%
 	s%~%@{echo kill%p'
 }