During insert mode my Home key is set to toggle case of character which is very annoying. I tried this command to search for any settings, but failed to solve the problem. I would like to set it to go at the beginning of a line ("0").

:redir! > vim_key_setting.txt
silent verbose imap
redir END

I pasted this file on pastebin.com: vim_keys_map.txt

Pressing the Home key while in insert mode shows following message in the status line:


Update: It seems to be a tmux problem with the escape characters, since the bug doesn't occur in tilix,konsole or alacritty(w/o tmux).

Weird enough the END key works and vim -g (vim gui) runs as expected.

  • In Insert mode what is inserted if you type <Ctrl-v><Home>? Commented Nov 21, 2022 at 14:47
  • ^[[1~ as posted above.
    – abu_bua
    Commented Nov 21, 2022 at 14:50
  • Looks like Vim doesn't detect ^[[1~ as the "home key" and treats it as literal text (~ toggles case). What is the value of your TERM environment variable? Usually setting that to the correct value fixes things (e.g. tmux-256color for tmux). Commented Nov 22, 2022 at 7:18
  • Yesterday I played quite a lot and I saw that tmux was upgraded to 3.3a. They did something with the $TERM setting. Before the update I had to set it to TERM=xterm-256color. In the tmux's instruction it is said that there is no need to set this variable. So I unset it in my .zshrc . However the HOME key works in that case. The only problem is that I can't get vim in color now :(. Without setting echo $TERM shows me tmux-256color. I also played within the .tmux.conf setting set -g default-terminal "tmux-256color ... but nothing changed.
    – abu_bua
    Commented Nov 22, 2022 at 13:24

2 Answers 2


I would add the following setting in your .vimrc

set <Home>=^[[1~

Where ^[ is inserted using the following key sequence CtrlvEsc

  • It doesn't help. It seems to be an issue with the terminal; I'm using tmux - alacrity .With another konsole (tilix) there is no problem. So I assume the fault behaviour has to do with the escape characters of alacritty/tmux. It has chaned this week so I will look at the package upgrades of my debian/sid.
    – abu_bua
    Commented Nov 21, 2022 at 15:09

To my surprise it wasn't a tmux problem, even the bug occurred only when a terminal (tilix, konsole, alacritty, kitty) used tmux.

First of all tmux (>3.3a) doesn't need an environment variable any more like TERM=xterm-256color nor is it necessary to set the default-terminal variable in the tmux.conf file.

The reason for the bug was an installed theme. Following the instructions I set

    set termguicolors

Uncommenting it saved my day.

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