It's possible to recover a deleted pg_hba.conf linux postgresql file? If anyone delete the pg_hba.conf file, and don't run "pg_ctl reload", the configuration of the deleted file is still working.
With that in mind, could someone put in a new file that info wherever it is?
If you are using Postgres 10, then this is possible through the view  pg_hba_file_rules

For earlier versions, I am not aware of any way to retrieve that.