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lstk: add /bin/lstk to dump most recent crashed proc

--- /dev/null

+++ b/rc/bin/lstk

@@ -1,0 +1,10 @@

+#!/bin/rc

+

+if(~ $#* 1)

+	p=$1

+if not if(~ $#* 0)

+	p=`{ps | grep Broken | awk '{print $2}' | sort -n | tail -n 1}

+if not

+	p 'usage: $0 [broken]' >[2=1]

+

+echo 'lstk()' | acid $p