soatick - generate a serial number suitable for use in a DNS SOA record, based on the current date, but keeping a state file so that if run multiple times on the same day, then a new serial number will be generated
Serial number format:
2011010502
YYYYMMDDNN
NN starts at 00 and increments by one each time soatick is called on the same day. If NN overflows, carries will propagate treating the serial number as an integer (which may cause the DD and MM fields to move outside of the range expected for months and days). Calls to soatick on subsequent days will output values so that the serial number still increases - i.e. behaviour will still be safe.
State is stored in soatick.state in the working directory.
Algorithm: A = state file, incremented by 1. If the state file does not exist, treat it as containing 0. B = today's base serial number, NN=00 Output = max(A,B) Output goes to state file and to stdout