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with statefile:

# ./installer -nodisplay -noconsole -state /path/to/directory.state.txt

or wherever the statefile happens to be.

More installer info:

# ./installer -help
Options recognized by the installer are:
-help Display this help text.
-id Prints a state file ID to the screen.
-no Runs the installer without installing software.
-noconsole Start the installer without a user interface. Use
with -state and -nodisplay to initiate silent
installation.
-nodisplay Starts the installer without launching the
graphical interface.
-saveState Writes input from an interactive installation
session to the specified file. The default file
name is statefile.out.
-state Uses the state file as input for silent
installation. Use with -noconsole.

1. set your DISPLAY

2. # /var/sadm/prod/entsys/uninstall

3. remove the leftover directories and files in the install directory

4. rm /var/sadm/install/productregistry