You could write a short script and run it via cron every couple of minutes.
pmset -g batt
Running the above will show your current battery usage. You can then parse it out and you can make it alert you with something like:
say "low battery power"
That will speak out "low battery power. Or to make it beep:
printf "\a"
I have a desktop, so can't see the pmset output, a quick google shows something like this would do it:
if [[ `pmset -g batt | awk -F'[^0-9]*' '{ print $3 }'` -lt 10 ]];then say "Battery low";fi
You can put that into a cron to run every 5 mins or so.
To add this to cron to run every 5 minutes, do:
crontab -e
and type in a line that looks like this:
*/5 * * * * if [[ `pmset -g batt | awk -F'[^0-9]*' '{ print $3 }'` -lt 10 ]];then say "Battery low";fi
Then save and exit. The crontab editor will be whichever is set as your default editor in $EDITOR. For me that vim, default OSX it's nano.
crontab -l
That lists out your crontab. For more info see: enter link description here
To use launchd, you'd be better off putting that into a shell script, then putting a launchd plist file in your ~/Library/LaunchDaemons folder. That's somewhat out of scope of this answer, Lingon is a great tool to control LaunchD files. See LaunchD for more information. You shell script would be be the same command as used above, with
#!/bin/sh
as the first line. Save it somewhere, make LaunchD run it.
Best Answer
The SCTP reference implementation has an NKE version for Mavericks.
The repository is at http://code.google.com/p/sctp-refimpl/
A pre-built version can be found at https://nplab.fh-muenster.de/groups/wiki/wiki/bf935/SCTP_on_Mavericks.html