ref: dfb8d83c44195a8b97c06d6920b3fb8c4ed6cd19
dir: /rc/bin/dircp/
#!/bin/rc
# dircp src dest - copy a tree with tar
switch($#*){
case 2
	@ {builtin cd $1 && tar cif /fd/1 .} | @ {builtin cd $2 && tar xTf /fd/0}
case *
	echo usage: dircp from to >[1=2]
	exit usage
}