tail command to follow the log file continuous upgrade

tail -f (name of log file)
( The tail -f command can be used to monitor the growth of a file being written by another process)

How to check configuration AIX including machine make

#prtconf more

What to monitor on Java System - nutshell

You may quickly monitor the java system by :
1) Accessing the URL
2) System Info - All processes are running
3) Default trace and application trace for Server0 and Dispatcher
4) JCMON
5) sappfparcheck for all java profiles

Standalone TREX Installation

If you are using a standalone TREX installation then configure the RFC with the central instance of ABAP not with the application server ( the same can happen if you have installed TREX on sam application server)

Other thing to keep in mind is that the https:// service should be running and if you install 32-bit TREX on a 64-bit system then there is a work around to do the same.