Refresh all files in buffer from disk in vim

Question

The command to refresh a file from version on disk is :e!

How can I do the same for all files in the buffer?

Background: I need that because I am u

Answer 1

From :help autoread:

When a file has been detected to have been changed outside of Vim and it has not been changed inside of Vim, automatically read it again. When the file has been deleted this is not done.

If, like me, you just want to always passively reload stale-but-unmodified buffers, then this seems like it should get the job done.

However the final detail is when vim notices the stale buffer. That can be forced with checktime. If you have focus events set up, then we can run checktime whenever we gain focus like so:

set autoread
autocmd FocusGained * checktime

This answer also has some interesting details.