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add usage messages to auth/(enable disable status).

print useful message when user invokes these commands incorrectly
(thanks henesy)

--- a/sys/src/cmd/auth/disable

+++ b/sys/src/cmd/auth/disable

@@ -1,4 +1,10 @@

 #!/bin/rc

+

+if(! ~ $#* 1){

+	echo 'usage: auth/disable user' >[1=2]

+	exit usage

+}

+

 if(test -e /mnt/keys/$1)

 	echo -n disabled > /mnt/keys/$1/status

 if(test -e /mnt/netkeys/$1)

--- a/sys/src/cmd/auth/enable

+++ b/sys/src/cmd/auth/enable

@@ -1,4 +1,10 @@

 #!/bin/rc

+

+if(! ~ $#* 1){

+	echo 'usage: auth/enable user' >[1=2]

+	exit usage

+}

+

 if(test -e /mnt/keys/$1)

 	echo -n ok > /mnt/keys/$1/status

 if(test -e /mnt/netkeys/$1)

--- a/sys/src/cmd/auth/status

+++ b/sys/src/cmd/auth/status

@@ -1,4 +1,10 @@

 #!/bin/rc

+

+if(! ~ $#* 1){

+	echo 'usage: auth/status user' >[1=2]

+	exit usage

+}

+

 cd /mnt/keys/$1 > /dev/null >[2=1] && {

 	stat=`{cat status}

 	exp=`{cat expire}

-- 

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