IOC Shell Persist history: ERROR Permission denied (13) writing '.iocsh_history'

["Webb, Brad via Tech-talk" <tech-talk at aps.anl.gov>]

After upgrading to EPICS 7.0.8.1 I see the errors below in the IOC start-up console output. 
ERROR Permission denied (13) writing '.iocsh_history'
ERROR Permission denied (13) writing '.iocsh_history'

From the release notes:
https://urldefense.us/v3/__https://github.com/epics-base/epics-base/blob/7.0/documentation/RELEASE_NOTES.md*persist-history__;Iw!!G_uCfscf7eWS!fxC6WWyvShbxHs8jPNfGxcc-Yd3gb7wGySPtGjoGKon5HqQERrpNd3FD4NrQvKubT7JRig5xbohNUi8W3jbS$ 

I find this section about setting the environment variable:
Persist history
Attempt to read and write command to a file (./.iocsh_history by default). Name may be overwritten
with by setting $EPICS_IOCSH_HISTFILE to an alternate path, or disabled by setting to an empty
string.

So, my question is how can this variable be set on a per IOC basis so that each IOC can have its own
unique path for the history file?

-Brad