Comparing the outputs of two processes

[prmac]

Hi. I've hit a bit of a stumbling block while trying to write a pipeline. I have two processes: one checks the version of a database on disk, the other checks the remote version. What I want to achieve is to proceed with the pipeline if the remote database is newer than the local one (download, index the remote etc.).

I can't seem to get my head around the best way to achieve this. Any help would be appreciated.