ref: 3b376b43af24f8013d330eb2eb9c3b78849bb7c3
dir: /sys/lib/man/mksearchindex/
#!/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