# Revision history [back]

From the man page:

duration:value switch to the next file after value seconds have elapsed, even if the current file is not completely filled up. Floating point values (e.g. 0.5) are allowed.

interval:value switch to the next file when the time is an exact multiple of value seconds

Using a value of 8 seconds I got the following output with duration:

_00001_20190808113539
_00002_20190808113547
_00003_20190808113555
_00004_20190808113604
_00005_20190808113612
_00006_20190808113621

and for interval:

_00001_20190808112634
_00002_20190808112640
_00003_20190808112648
_00004_20190808112656
_00005_20190808112704
_00006_20190808112712

You can see that duration is (approximately) equally spaced after the initial start time whereas the interval starts the second file at the next multiple of 8 (not sure where it starts from, maybe the current minute). Given a larger interval, e.g. 3600, I suspect that after the first file, all others will start on an exact hour boundary.