The given text appears to be a command for deploying the DynDNS service, which updates and configures Dynamic DNS entries for public or private IP addresses. The command starts by reading two environment variables
/root/.hermes/skills/cf-dyndns from cron:
2>&1, indicating that it is running as a scheduled task (cron job), where the additional redirects (
2>&1) ensure that any standard error output is captured and then redirected to prevent issues with the cron journal.
``
bash
/bash /root/.hermes/skills/cf-dyndns.sh 2>&1
`
- **Sending No reply**: The response can be silent, not printing anything at all (NoReply
).
- **Warning about Error message in output**:
`
bash
if [[ -z $OUTPUT ]] || [ ${OUTPUT #* "STATUS:NO_CHANGE"} != * NO_CHANGE ] ; then
echo "WARNING: DynDNS ERROR"
fi
`
- **Sending updates**: If an update indicates success (->
or OK:
):
`
bash
if [[ -n $OUTPUT ]] && [[ -z $DEBUG ]]; then
case $PROTOCOL in
HTTP) echo "Updated DynDNS with success" ;;
HTTPS) echo "Updated DynDNS with $PROTOCOL upgrade" ;;
esac
if [ ${OUTPUT #* "->"} == * Ok ]; then
case $PROTOCOL in
HTTP) message="Updated DynDNS by OK: $(echo -e "${URL} -> \$(curl -s -o - $OUTPUT)")" ;;
HTTPS) message="Updated DynDNS by Ok: $(echo -e "${url} > \$(curl -s -o - ${OUTPUT})")" ;;
esac
elif [ -n ${ALIAS} ]; then
case $PROTOCOL in
HTTP) echo "DynDNS updated using alias: ${ALIAS}/(http://${URL})" ;;
HTTPS) echo "DynDNS updated by alias: $(echo $? > /dev/null); (ssh ${ALIAS}' http://${URL}')" ;;
esac
else
echo "$message"
fi
fi
`
- The process can be repeated in a loop based on the status messages obtained:
`
bash
for (( i=0; i<$N; i++ )); do
case output in
"NO_REPLY") echo "" ;;
ERROR) echo "" ;;
SUCCESS) for protocol in http https; do message=\"DynDNS update failed for $protocol by ${output} -> $(curl $protodomain);\" ; (echo "${message}") ; done;;
esac
done &
`
- **Cleaning up**:
After executing the DynDNS script, ensure that resources are cleaned as necessary. This approach minimizes the potential damage to your system if something goes wrong:
`
bash
unset PROTOCOL_Alias URL ALIAS $HOME/.ssh
``