backspace not working, even after attempted fix

I tried following the instructions in Backspace key not working in vim , but I still have the same problem: BACKSPACE inserts a ^?

That is to say: inserting set bs=indent,eol,start in my ~/.vimrc did not solve the problem.

I am sure that I am loading the correct source file (I did a test of another setting, and the change propagated).

I am using: Vi IMproved 7.2 on Ubuntu with Gnome. In the terminal application, backspace works properly.

Solution 1:

Vim seems to be confused about what your terminal sends as the erase character. As this varies between ^? (Ctrl+?, or DEL for "delete") and ^H (Ctrl+H or BS for "backspace"), Vim depends on someone telling it what to expect.

That shouldn't happen unless

• you're changing related settings in your vimrc,
• you're changing the value of the TERM environment variable,
• your terminal information database is messed up, or
• you're suffering from a gremlin infestation.

For troubleshooting, try to run the command stty erase ^? before starting Vim, and see if this fixes it. Enter the ^? not separately as ^ and ?, but by first pressing Ctrl+V, then your Backspace key. If your shell is well-behaved, this should produce a literal representation of whatever your terminal sends when you hit that key.

Solution 2:

Found this question while searching for something mildly related, and thought I'd post a pedantic (but possibly helpful) follow-up.

Most modern versions of stty(1) (including the version shipped with GNU Coreutils) interpret the two-character sequences ^ ? and ^ h as the control sequence ASCII DEL and ASCII BS (respectively). Or more generally, two-character sequences starting with ^ as their equivalent ASCII control character.

So the two following commands are equivalent:

stty erase '^?'
stty erase ^VDEL

Solution 3:

If you are using gnome-terminal then there should be a setting to have backspace emulate ^H. There are similar settings in other terminal emulators; it's the first place I would go since no one else has mentioned it.