path: litecoin_0.21.4-1/doc/developer-notes.md
```bash
$ lsof -p $(pidof litecoind) |\
    awk 'BEGIN { fd=0; mem=0; } /ldb$/ { if ($4 == "mem") mem++; else fd++ } END { printf "mem = %s, fd = %s\n", mem, fd}'
mem = 119, fd = 0