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x/mnt: mount the system suggested by path if given no args 

--- a/mnt

+++ b/mnt

@@ -3,14 +3,14 @@

 rfork e

 fn usage {

-	echo usage: x/mnt [user@]host >[1=2]

+	echo usage: x/mnt [[user@]host] >[1=2]

 	exit usage

 }

 users=(root $user)

-if(! ~ $#* 1)

-	usage

 host=$1

+if(~ $host '')

+	host=`{x/path -l}

 if(~ $host *@*){

 	x=`'@'{echo -n $host}

 	users=$x(1)

--- a/x.man

+++ b/x.man

@@ -4,7 +4,11 @@

 .SH SYNOPSIS

 .PP

 .B x/mnt

-.I [user@]host

+[ [

+.I user@

+]

+.I host

+]

 .PP

 .B x/run

 .RB [ -l ]

@@ -66,6 +70,12 @@

 .B x/mnt

 tries the mount as both the invoking user and as

 .I root.

+If both the

+.I user

+and

+.I host

+are missing, it attempts to mount the system suggested by the

+current working directory.

 .PP

 .B x/run