nostr-mirror.sh

#!/bin/bash
# Mirrors notes from one nostr relay to another.
#
# Example usage:
# nostr-mirror.sh wss://source.relay.example wss://target.relay.example

# Source relay to fetch events from (wss://...).
SOURCE=$1
# Target relay to send these events to (wss://...).
TARGET=$2

echo '["REQ", "mirror", {}]' | \
  websocat -n --ping-interval 20 -B 400000 "${SOURCE}" | \
  jq -c '[.[0,2]]' --unbuffered -M  | \
  websocat -n --ping-interval 20 -B 400000 "${TARGET}"