How do you share history between terminals in zsh?

The following options would be applicable:

• To save every command before it is executed (this is different from bash's history -a solution):

   setopt inc_append_history
  

• To read the history file everytime history is called upon as well as the functionality from inc_append_history:

   setopt share_history
  

These can be set in your .zshrc file.

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⚠️ Either set inc_append_history or share_history but not both. (see comments bellow)

• When share_history is enabled, it reads and writes to the history file.
• When inc_append_history is enabled, it only writes to the history file.

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Related for bash:

• Is it possible to make writing to .bash_history immediate?

If you use Robby Russell’s awesome OhMyZSH, it will take care of this and more.

See https://github.com/robbyrussell/oh-my-zsh/blob/master/lib/history.zsh

That includes setopt inc_append_history.