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rcpu: fix pvar to initialize empty variables (thanks mycroftiv)

--- a/rc/bin/rconnect

+++ b/rc/bin/rconnect

@@ -10,7 +10,8 @@

 fn pvar {

 	while(! ~ $#* 0){

-		~ $#$1 0 || path=/dev/null builtin whatis $1

+		~ $#$1 0 && echo $1'=()' ||

+			path=/dev/null builtin whatis $1

 		shift

 	}

 }

--- a/rc/bin/rcpu

+++ b/rc/bin/rcpu

@@ -76,7 +76,8 @@

 fn pvar {

 	while(! ~ $#* 0){

-		~ $#$1 0 || path=/dev/null builtin whatis $1

+		~ $#$1 0 && echo $1'=()' ||

+			path=/dev/null builtin whatis $1

 		shift

 	}

 }

--- a/rc/bin/rexport

+++ b/rc/bin/rexport

@@ -49,7 +49,8 @@

 fn pvar {

 	while(! ~ $#* 0){

-		~ $#$1 0 || path=/dev/null builtin whatis $1

+		~ $#$1 0 && echo $1'=()' ||

+			path=/dev/null builtin whatis $1

 		shift

 	}

 }

--- a/rc/bin/rimport

+++ b/rc/bin/rimport

@@ -44,7 +44,8 @@

 fn pvar {

 	while(! ~ $#* 0){

-		~ $#$1 0 || path=/dev/null builtin whatis $1

+		~ $#$1 0 && echo $1'=()' ||

+			path=/dev/null builtin whatis $1

 		shift

 	}

 }

-- 

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