mastodon-followers.sh

#!/usr/bin/env bash
set -euo pipefail

(($# == 2)) || (echo "usage: $0 <instance> <user>" >&2; exit 64)

instance=$1 user=$2
next="https://${instance}/users/${user}/followers?page=1"
while [[ ${next} != "null" ]]; do
  readarray -t urls < <(
    curl -SsfH 'accept: application/activity+json' "${next}" \
      | jq -r '.next, .orderedItems[]'
  )

  next="${urls[0]}"
  printf "%s\n" "${urls[@]:1}"
done