plan9fox/sys/lib/man/mksearchindex

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#!/bin/rc
awk '
{ if($2 in a) a[$2] = a[$2] " " $1; else a[$2] = $1; }
END { for(i in a) print " " a[i] " " i; }
'< /sys/lib/man/lookman/index |sed 's/ \/sys\/man\/(.*)\/(.*)/ \2 \1\/\2/' | sort