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I've seen this answer:

Preserve bash history in multiple terminal windows

This works for history, but I'm wondering if there is way to extend this so pressing "up" is shared as well?

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How does this differ from the second point in the post you linked? –  Kevin Apr 19 '12 at 18:01
    
it's not, but none of the solutions I saw seemed to accomplish that point –  A Question Asker Apr 19 '12 at 18:04
    
You need to get a new prompt by pressing enter in the second terminal after running the command in the first. –  Kevin Apr 19 '12 at 18:40

2 Answers 2

While bash doesn't have this exact behavior, zsh can do this with

setopt inc_append_history share_history

See How do you share history between terminals in zsh?

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It should be possible by telling bash to write out and re-read the history after each command. Untested:

PROMPT_COMMAND="$PROMPT_COMMAND"$'\nhistory -a; history -n'

Sharing the history is the default behavior of ksh. In zsh, you get this behavior by turning on the share_history option, and you can get much finer control over how the history is saved and merged by tweaking other history options.

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