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Add Set Up Forwarding Prefix For Nested Session as a tmux TIL

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jbranchaud
2025-12-31 12:10:52 -07:00
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README.md
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@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
For a steady stream of TILs, [sign up for my newsletter](https://visualmode.kit.com/newsletter). For a steady stream of TILs, [sign up for my newsletter](https://visualmode.kit.com/newsletter).
_1713 TILs and counting..._ _1714 TILs and counting..._
See some of the other learning resources I work on: See some of the other learning resources I work on:
@@ -1569,6 +1569,7 @@ If you've learned something here, support my efforts writing daily TILs by
- [Reset An Option Back To Its Default Value](tmux/reset-an-option-back-to-its-default-value.md) - [Reset An Option Back To Its Default Value](tmux/reset-an-option-back-to-its-default-value.md)
- [Set Environment Variables When Creating Session](tmux/set-environment-variables-when-creating-session.md) - [Set Environment Variables When Creating Session](tmux/set-environment-variables-when-creating-session.md)
- [Set Session Specific Environment Variables](tmux/set-session-specific-environment-variables.md) - [Set Session Specific Environment Variables](tmux/set-session-specific-environment-variables.md)
- [Set Up Forwarding Prefix For Nested Session](tmux/set-up-forwarding-prefix-for-nested-session.md)
- [Show The Current Value For An Option](tmux/show-the-current-value-for-an-option.md) - [Show The Current Value For An Option](tmux/show-the-current-value-for-an-option.md)
- [Swap Split Panes](tmux/swap-split-panes.md) - [Swap Split Panes](tmux/swap-split-panes.md)
- [Switch To A Specific Session And Window](tmux/switch-to-a-specific-session-and-window.md) - [Switch To A Specific Session And Window](tmux/switch-to-a-specific-session-and-window.md)

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tmux/set-up-forwarding-prefix-for-nested-session.md Normal file
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# Set Up Forwarding Prefix For Nested Session
I use
[`ctrl-z`](https://github.com/jbranchaud/dotfiles/blob/main/config/tmux/tmux.conf#L57)
(instead of `ctrl-b`) for my tmux prefix key. I also have [`ctrl-z
ctrl-z`](https://github.com/jbranchaud/dotfiles/blob/main/config/tmux/tmux.conf#L138-L139)
configured to toggle back and forth between the previously visited window.
With that in mind, I needed to set up a specific keybinding to send the prefix
key to an inner (nested) tmux session. That's because sometimes, like with a
tool such as `overmind`, you can end up connected to a tmux session while
already within a tmux session.
So, I have `Ctrl-z a` send the prefix key to the inner tmux session. This is
what I added to my
[`tmux.conf`](https://github.com/jbranchaud/dotfiles/blob/main/config/tmux/tmux.conf#L167-L168):
```
# send prefix to inner tmux session (C-z a)
bind-key a send-prefix
```
Simply doing `Ctrl-z d` will detach me from the outer tmux session. If I want to
detach from an inner tmux session, I can use my new keybinding -- `Ctrl-z a d`.