To begin please run get_tle.py, preferably add it to a daily cron task. Afterwards run "bash sats.sh NOAA-##" for NOAA-15, -18, or -19 (your preference). The sats.sh file runs itself after completion so there are few reasons to run it twice. If you must rerun the sats.sh script you will need to wipe the At Queue, see below.