Have you looked at Utility exportNSHScriptRun ?
You can get RunIDs from something like
JobRun findLastRunKeyByJobKey (if you don't have to worry about multiple instances of the job running concurrently)
Is that a blcli comamnd available in 7.6?
EDIT: Nevermind, I just found it in the released commands documentation!
That would work great I believe, thanks!
The other option (that I can't get to work) would be
This has two parameters whose function seems obvious but I can't find a way to generate the objects (or ignore the parameters and do the sorting myself, which is a method i'd love to be able to use for a number of CLI functions):
sortParameter com.bladelogic.model.job.jobrun.LogItemSortParameter no description
sortOrder com.bladelogic.shared.db.QuerySortOrder no description