Output from configuration scripts is buffered, and is only output after the script has finished. This is inconvenient for long-running scripts. Instead, the output should be shown right away.
This buffering is done in file lib/sbin/ConfigScriptParser.pl, which uses Perl backquotes `` to collect all of the script's output. Instead, Cactus should use a pipe to read the script's output line-by-line, and process it immediately.