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pstree: remove unnecessary globbing and environment pollution (thanks cgnarne, cinap_lenrek)

--- a/rc/bin/pstree

+++ b/rc/bin/pstree

@@ -1,9 +1,7 @@

 #!/bin/rc

-p=0

-if(! ~ $#* 0)

-	p=$1

-cd /proc || exit

-ls -d [0-9]* | sort -n | awk -v 'this='^$p '

+if(~ $#* 0)

+	*=0

+cd /proc && ls | sort -n | awk -v 'this='^$1 '

 function cat(f,	v){

 	getline v < f

 	close(f)

@@ -12,7 +10,7 @@

 BEGIN{

 	OFS="\t"

 }

-{

+/^[0-9]+/ {

 	s = cat($1"/args")

 	if(s == ""){

 		s = cat($1"/status")

@@ -41,7 +39,7 @@

 END{

 	for(i=1; i<=length(pid); i++){

 		p = pid[i]

-		if(!(ppid[p] in proc) && ppid[p] != 0)

+		if(p && !(ppid[p] in proc) && ppid[p] != 0)

 			child[0,++nchild[0]] = p

 	}

 	out(this, "", "", 0)

-- 

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