ref: 8043614f797a269cfc9772998a3a1d46c139a1b7
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