B, Bfn: fix invocation with multiple files, improve manual page

rc/bin/B

@@ -10,6 +10,14 @@ if(~ $#* 0){
 	exit usage
 }
 
+if(test -f /mnt/plumb/edit || test -f /mnt/term/mnt/plumb/edit){
+	for(i)
+		plumb -s B -d edit $i
+	exit
+}
+
+# using sam srv file
+
 for(i)
 	switch($i){
 	case /*
@@ -18,14 +26,6 @@ for(i)
 		files = ( $files `{cleanname `{pwd}^/$i} )
 	}
 
-
-if(test -f /mnt/plumb/edit || test -f /mnt/term/mnt/plumb/edit){
-	plumb -s B -d edit $files
-	exit
-}
-
-# using sam srv file
-
 if(test -f /mnt/term/srv/sam.$user) dest = /mnt/term/srv/sam.$user
 if not if(test -f /srv/sam.$user) dest = /srv/sam.$user
 if not {

rc/bin/Bfn

@@ -14,5 +14,5 @@ switch($#res){
 case 0
 	echo $1: not found >[2=1]
 case 1
-	plumb $res
+	B $res
 }

sys/man/1/sam

@@ -17,9 +17,6 @@ sam, B, sam.save, samterm \- screen editor with structural regular expressions
 .B sam.save
 .PP
 .B B
-[
-.BI -nnnn
-]
 .I file ...
 .SH DESCRIPTION
 .I Sam
@@ -866,16 +863,13 @@ which acts as an additional source of commands.  Characters written to
 the named pipe are treated as if they had been typed in the command window.
 .PP
 .I B
-is a shell-level command that causes an instance of
+is a shell command that sends the named
-.I sam
+.IR files
-running on the same terminal to load the named
+to the edit port of the plumber.
-.IR files .
+If plumbing is not available,
-.I B
+it attempts to load 
-uses either plumbing or the named pipe, whichever service is available.
+.IR files
-If plumbing is not enabled,
+through the named pipe.
-the option allows a line number to be specified for
-the initial position to display in the last named file
-(plumbing provides a more general mechanism for this ability).
 .SS Abnormal termination
 If
 .I sam