AFAIK, Apigee onPrem 4.15.01 installation doc doesn’t talk about apigee-postgres-register.sh file. Are you sure you are referring to correct version of onPrem installation guide ? v4.15.04.00 installation document refers to apigee-postgres-register.sh file.
I believe you are using 4.15.04 installation doc & downloaded opdk installation code is 4.15.01. Please download 4.15.04 Apigee Edge installer. I have verified source code of 4.15.04 & installer file apigee-postgres-register.sh is present in same. Please see screenshot below.
Dear @Vasantharaja Kandasamy , Is your issue resolved then ? Are you referring to right codebase ? If you are referring to v4.15.04 then please download Apigee Edge Installer for same.
It’ll better if you send ApigeeEdgePrivateCloud-Install-Config-Guide.pdf for 4.15.01 version, since we have already installed 4.15.01 installer version.