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why is EXPORT PS1 in my .profile getting clobbered?

In this question How can I get KornShell to display the date and time in the prompt? all the variables are visible in ksh except PS1 which appears to be getting replaced somehow. How can I determine ...
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How can I change what's displayed at a login shell?

I'm getting more familiar with tweaking the way things look in a shell via the prompt (.bashrc), but I'm now trying to change the initial stuff displayed when I first log in. On my EC2 instance, this ...