The network pseudo filehandles (/dev/tcp/<host>/<port> and /dev/udp/<host>/<port>) are explicitly disabled in certain distros (notably Debian). Ubuntu appears to support it.
Though not limited to just shell redirections, one of the true masters of bash (and zsh) is Larry Peek whose written/given multiple books, articles, and presentations on the topic.
Though not limited to just shell redirections, one of the true masters of bash (and zsh) is Larry Peek whose written/given multiple books, articles, and presentations on the topic.