My terminal emacs displays weird characters (\u2506) for unvisiable characters in buffers

Question

I'm currently in a new environemnt, my emacs in terminal displays weird character in files, GUI Emacs works fine. I don't know how to express this, please see the following details:

Text edition:

#include <stdio.h>

int main()
{
\u2506        printf("hello world\n");
\u2506        return 0;
}

Image edition: https://i.stack.imgur.com/b5f0p.png

This "\u2506` characters are displayed in all files I've tried, and the files are displayed correctly in other programs such as vim or less.

I believe this is the problem of my new OS, since it works fine in another environment, and I got the same TERM(screen-256color+tmux) and SHELL(fish shell) in both environments.

How can get this fixed? If you need any info, pelase let me know.

Answer 1

I found out that this is the problem of the variable LANG,

$ echo $LANG
en_US

But

$ cat /etc/locale.conf
LANG=en_US.UTF-8
$ localctl status
System Locale: LANG=en_US.UTF-8
...

After I export the LANG to en_US.UTF-8, and problem is gone.

I don't know why echo $LANG returns en_US. This OS is managed by administrator in my company and a lot of files have been changed, and I've been using Linux for several years, and this is the first time this problem happens to me.

Anyway, if anyone has the same problem, please change your LANG variable to en_US.UTF-8.

---

UPDATE:

Actually, only seeting LANG is not perfect, so now I use export LC_ALL=en_US.UTF-8 in ~/.bashrc

In case other issues happen in the future, you may need to put the following three into ~/.bashrc

export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
export LANGUAGE=en_US.UTF-8