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til/tmux/change-the-default-prefix-key.md
2020-12-18 22:18:40 -06:00

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# Change The Default Prefix Key
The _prefix_ key for tmux is a key that tells an active tmux session that the
following key should be interpreted as a tmux command instead of regular input
to the terminal.
By default, tmux has `Ctrl-b` bound to the prefix.
So, hitting `Ctrl-b` followed by `?` will open up the tmux help.
Typing `Ctrl-b` involves a bit of a finger stretch. It can be changed to
something more comfortable. My personal preference is `Ctrl-z`. Many
configurations I've seen use `Ctrl-a`.
To change this, open up your `~/.tmux.conf` file and add two lines.
```
unbind C-b
set -g prefix C-z
```
And then run `:source-file ~/.tmux.conf`.
This tells tmux to unbind `Ctrl-b` so that it no longer is interpreted as the
prefix, and then it binds `Ctrl-z` as the new prefix key.