History only append feature (like fish shell)

[Deshdeepak1]

$ ble summary

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history share option currently allows to sync history between multiple shells. But I only want that all new shells have history of all previous running shells. This is how fish shell currently works. Currently I just include history -a in PROMPT_COMMAND. A ble option would be nice.

[akinomyoga]

Currently I just include history -a in PROMPT_COMMAND.

This is sufficient. The reason that I added history_share for history -a; history -c; history -r is that reloading the entire history for every command is inefficient, and the line editor can improve the behavior by not reloading the entire history. In the case of history -a, there is no inefficiency, so you can continue to use history -a in PROMPT_COMMAND.

A ble option would be nice.

I might add a special value for history_share.