Thanks for the post.
For info related to upgrading 12.2.0 to 12.2.5, please review below:
1) Oracle E-Business Suite Release 12.2: Technical Planning, Getting Started, and Go-Live Checklist (Doc ID 1585857.1)
2) Applying the Latest AD and TXK Release Update Packs to Oracle E-Business Suite Release 12.2 (Doc ID 1617461.1)
3) Oracle E-Business Suite Release 12.2.5 Readme (Doc ID 1983050.1)
Additionally, the file EBSapps.env is provided by the AD/TXK patches.
So, if the instance is on the base release i.e., 12.2.0, the file EBSapps.env will not be present in the <EBS_BASE>. Only upon applying the latest EBS Patches, the file will be created.
Hope this helps!!!
Which phase of upgrade are you in now as per below doc?
EBSapps.env comes with AD.C.5 till then use /ora/oracle/VIS/fs1/EBSapps/appl/APPSVIS_erp12.env (run file system APPS<CONTEXT_NAME>.env. Once you apply the latest AD.5 or 7 , you can start using EBSapps.env