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When I am running in tmux and use C-b ?, I can get a list of all the commands.

However, I observe that some commands are bind-key, followed by the command, and others are bind-key -r, followed by the command.

I did quite a bit of searching, but couldn't find documentation that explained the difference.

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up vote 16 down vote accepted

Quoting the TMUX(1) manpage:

The -r flag indicates this key may repeat, see the repeat-time option.

And a quick search for repeat-time yields this:

repeat-time time
Allow multiple commands to be entered without pressing the prefix-key again in the specified time milliseconds (the default is 500). Whether a key repeats may be set when it is bound using the -r flag to bind-key. Repeat is enabled for the default keys bound to the resize-pane command.

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