Install Scripts and Customization - Lesson Learned!!

I was unable to install the 3.0.1.1 Jazz Team Server and CLM
I was running the following in ksh on AIX:

(where $RTCLATEST=/rtc3011)

./userinstc -dataLocation $RTCLATEST/silent-install/data -silent -showVerboseProgress -nosplash -input silent-install-server.xml -acceptLicense


This failed repeatedly (even after I removed /rtc3011/silent-install)

Output was as follows:

<snipped>
Preparing Jazz Team Server and CCM, QM, and RM Applications.
Preparing Jazz Team Server and CCM, QM, and RM Applications. Complete for eclipse
Preparing Jazz Team Server and CCM, QM, and RM Applications.
Computing feature dependencies of Jazz Team Server and CCM, QM, and RM Applications.
jfs.base
calm.license
Jazz Team Server
Change and Configuration Management
Requirements Management
Quality Management
Tomcat Application Server v5.5
Computing feature dependencies of Required Base License Keys, including Trials, for Rational Team Concert, Rational Quality Manager and
Rational Requirements Composer.
jfs.base
server.conf
server.provision
Analyzing Jazz Team Server and CCM, QM, and RM Applications
Analyzing Required Base License Keys, including Trials, for Rational Team Concert, Rational Quality Manager and Rational Requirements C
omposer
Processing com.ibm.team.install.calm.main
Processing com.ibm.team.install.jfs.app.product-rtc-standalone.main
Processing com.ibm.team.install.jfs.base.main
<snipped>

Then
Processing com.ibm.team.install.jfs.app.rtc.context.itlm.ext
Processing com.ibm.team.install.jfs.app.rtc.itlm.main
Calculating requirements and dependencies.
Computing prerequisite plan
Calculating requirements and dependencies.
Computing prerequisite plan
<snipped>
Calculating requirements and dependencies.
Computing prerequisite plan
.
CRIMA9B6059A2E ERROR: Error installing.
CRIMA9B6059A2E ERROR: The installation directory '/rtc3011/silent-install/JazzTeamServer' exists and contains files. Use an empty directory or delete all files in the current directory.
CRIMA9B6059A2E ERROR: The installation directory '/rtc3011/silent-install/JazzTeamServer' exists and contains files. Use an empty directory or delete all files in the current directory.------------------------------------------------------------

On a whim, I decided to replace $RTCLATEST with /rtc3011, and the command was successful.

I have been writing instructions for the team, and trying to build a reusable script as I proceeded, thus the environment variables.
I could not find this Install Manager error anywhere, and thought I would post this to the forum in case someone else ever encounters it, I doubt I am the only one to try to write some user level scripts :)