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  • Well I wouldn't say US is totally invisible. When I insert that character into a terminal with Ctrl+/ (confirmed via <C-v><C-/>), it deletes an unpredictable amount of text on the line. I don't fully understand its behavior, but it seems to mainly have some sort of "reverse tab" effect where instead of inserting a number of spaces, it deletes a number of characters, but then sometimes it randomly inserts text, so it's confusing. Commented Aug 7, 2016 at 15:24
  • As of Debian 10 (gnome-terminal v.3.30.2) the separator characters are invisible but in Debian 9 it was fine... Commented Apr 7, 2020 at 12:17
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    @BradenBest In most shells, incl. bash and zsh, ^_ is bound to undo. Commented Oct 31, 2021 at 19:24
  • @MarlonRichert Good to know Commented Nov 17, 2021 at 16:26
  • @SylvainLeroux's answer shows how to enter ^_ in Bash, with $'\c_' .unix.stackexchange.com/a/128075/268154 Commented Jul 17, 2023 at 18:41