/usr/share/doc/liquidsoap/html/scripts/bubble.liq is in liquidsoap 1.1.1-7.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | add_protocol("bubble",
fun (arg,delay) ->
get_process_lines("/usr/bin/bubble-query "^quote(arg)))
|