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rcpu: use $cpu environment variable for host when not specified

--- a/rc/bin/rcpu

+++ b/rc/bin/rcpu

@@ -52,6 +52,7 @@

 cmd=()

 host='$cpu'

+if(~ $#cpu 1) host=$cpu

 exportfs=/bin/exportfs

 connect=/bin/rconnect

--- a/sys/man/1/rcpu

+++ b/sys/man/1/rcpu

@@ -105,6 +105,13 @@

 to allow further customization of the environment (see

 .IR rc (1)

 for more information).

+The cpu server can be specified with

+.B -h

+.IR host ,

+otherwise it defaults to the environment variable

+.B $cpu

+or is looked up from

+.IR ndb (6).

 .PP

 .I Rimport

 mounts a remote directory