This code displays the last 10 lines of a twtxt feed without a full dowload.
FEED_URL="https://twtxt.net/user/prologic/twtxt.txt"
MAX_RANGE=$(curl -sI $FEED_URL | grep -i 'content-length' | awk '{print $2}' | tr -d '\r')
MIN_RANGE=$((MAX_RANGE - 5000))
curl -s --range "$MIN_RANGE-$MAX_RANGE" "$FEED_URL" | grep -v -e '^#' -e '^$' | head -n 10
My self-response!