I use character in my zsh theme's for prompt. But in tmux, my prompt was behaving weirdly, showing extra spaces, like this:

♪ ~   I can type from here
♪ ~ Instead of here like in zsh, and sometimes when I do stuff like cd
♪ ~   cd ~
♪ ~ cdcd /
♪ ~ ^^These 2 chars just show up but are not actually part of command and not delete-able

I recently discovered that I can set tmux encoding to utf8 by set-window-option -g utf8 on. Doing that, the space problem was gone but character changed to _. How can I get my back in tmux?

My zsh-theme:

PROMPT='%{$fg_bold[cyan]%} ♪ %{$fg[blue]%}%c%{$fg_bold[blue]%}$(git_prompt_info)$(git_remote_status)%{$fg_bold[blue]%} % %{$reset_color%}'
  • I couldn't get set-window-option to work for me not found cmd. Please, could write exact steps to reproduce it. – user.dz Jan 25 '14 at 12:08
  • I used the tmux conf here (its also used here). It looks like tmux is converting every character that is not ASCII into _, when I set that option. – Sourabh Jan 25 '14 at 18:06

Starting tmux with u flag solves this issue

tmux -u

I've created an alias of tmux in my zshrc

alias tmux='tmux -u'
  • 1
    Thanks for the flag! It was so frustrating with all the gibberish when using tmux and nvim would go crazy with powerline! This solved the issue! Thanks again. – Dave Amit Dec 27 '16 at 7:23
  • For those who what to know why, check here, -u flag explicitly informs tmux that UTF-8 is supported – shellbye Jan 18 '17 at 9:22
  • 1
    Interesting. I thought setting set -g utf8 on in ~/.tmux.conf would solve this issue, but apparently it didn't. Using the flag explicitly when calling tmux does works though. Thanks a lot, you saved me a lot of hassle! – Tim Visee Aug 14 '18 at 15:06

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