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For some reason, occasionally, an uppercase M appears at the right side of the window name, so the window name looks like this:
1:bash*M
I'm pretty sure is because I'm pressing some combination that causes this. What is it and what does it means?
From tmux(1):
m Mark the current pane (see select-pane -m).
So that means you've pressed C-b m (or equivalent in your environment) to mark that pane.
Marking a pane is useful for certain pane operations; from the section on select-pane:
The marked pane is the default target for
-stojoin-pane,swap-paneandswap-window.
To clear the mark, press C-b M. If you have M mapped to something else already, you can also use C-b : (to enter the tmux command prompt), followed by select-pane -M to clear the mark.
Prefix + M in my tmux. What command can I use to unmark the pane (without enabling mouse mode)?
– byxor
Oct 26 '17 at 14:11
C-b : followed by select-pane -M to clear the mark. The original answer does mention "or equivalent", but presumably most tmux users are aware that C-b is the default prefix.
– jjlin
Dec 6 '17 at 8:59
The list of window flags with their explanation can be found in man tmux /STATUS LINE, you’re looking for:
Symbol Meaning
M The window contains the marked pane.
