I have some aix boxes and the fields being printed out by the df scipt are not correct. (the fields get off).
The problem is that the first call to df (/usr/sysv/bin/df -n), does not return every filesystem that the second call to df (/usr/bin/df -kP) returns.
So when this part of the format line runs:
$2 becomes empty (blank). Then when it's printed out there are fewer columns than the header states and the values are shifted.
Here is the my new FORMAT line (I just added in the if at the end):
Araitz's blog post points out that the 4.5 version of this app will be published onto Splunk's github and released under the Apache license. Once it is out there, I would recommend that you pull the app from their git tree and provide patches on there. That would be one of the quickest ways to get your change integrated into the code base.