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Michael_Jenkins's avatar
Michael_Jenkins
Icon for Cirrostratus rankCirrostratus
Jun 10, 2015

Maybe someone can correct me if I'm wrong, but I'm pretty sure you can't access the file system through an iRule.

As a possible way around that, you could set your cron job up to run a 

tmsh
command to update a 
data group
with your unique string. Then your iRule could read the string from the data group (I don't believe you can update a data group record within an iRule though).

Hope this helps.