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start, stop: avoid null list in concatenation witout arguments, use $user

--- a/rc/bin/start

+++ b/rc/bin/start

@@ -1,5 +1,4 @@

 #!/bin/rc

-U=`{cat /dev/user}

-ps | sed -n '/^'$U' .*Stopped.* '$1'$/s%[^ ]*  *%~>/proc/%

+~ $#* 0 || ps | sed -n '/^'$user' .*Stopped.* '$1'$/s%[^ ]*  *%~>/proc/%

 s%  *.*%/ctl%

 s%~%echo start%p'

--- a/rc/bin/stop

+++ b/rc/bin/stop

@@ -1,5 +1,4 @@

 #!/bin/rc

-U=`{cat /dev/user}

-ps | sed -n '/^'$U' .* '$1'$/s%[^ ]*  *%~>/proc/%

+~ $#* 0 || ps | sed -n '/^'$user' .* '$1'$/s%[^ ]*  *%~>/proc/%

 s%  *.*%/ctl%

 s%~%echo stop%p'

-- 

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