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I often find myself switching between Bash and Zsh, and using the history search functionality to recover a command.

However, since Bash and Zsh have different history files, I often find that the command I'm searching for has been executed in the other shell.

Is there any way to share or synchronize history between the two?

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The syntax of bash and zsh is different enough that you'd end up with many commands that don't work when copied to the other shell. –  Gilles Sep 19 '11 at 23:41
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2 Answers

up vote 3 down vote accepted

If you are using the defaults for bash and zsh:

$ cat ~/.histfile >> ~/.bash_history
$ youreditor ~/.zshrc
# Here change your config to:
HISTFILE=~/.bash_history
$ rm ~/.histfile

Now you have the same file for history in both shells.

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Not exactly what you were looking for, but in order to import from bash to zsh, you can use this node.js script.

   // This is how I used it:
   // $ node bash-history-to-zsh-history.js >> ~/.zsh_history

   var fs = require("fs");
   var a = fs.readFileSync(".bash_history");
   var time = Date.now();
   a.toString().split("\n").forEach(function(line){
     console.log(": "+ (time++) + ":0;"+line);
   });

Source

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