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Cunningham, all the terminals interact with your shell program. The shell program manages the history. The terminals are just computer interfaces for text entry and display, they do not know about your shell history.
I think if you closed all your terminals and run them all, then pressing key-up would display the same command from history.
When you have executed a bunch of commands on each of the terminals and you close them, bash overwrites .bash_history again and again with history in each session.
You should see my previous comment I answered Josh on how to have a unified .bash_history accross all bash sessions (no matter what terminal).
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It would be nice if you left your e-mail address. Sometimes I want to send a private message, or just thank for the great comment. Having your e-mail really helps.
I will never ever spam you.
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* use <pre>...</pre> to insert a plain code snippet.
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