[Bug 252091] forward delete key does not work for root user

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252091

            Bug ID: 252091
           Summary: forward delete key does not work for root user
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: sean at rogue-research.com

The forward delete key (aka "delete" aka "del", but *not* the "backspace" key)
does not work for the root user.

I have just created a vanilla FreeBSD 12.2-p1 (current newest) VM and if I ssh
to this server (from macOS 10.14.6, if it matters) as my own user then both the
forward and backward delete keys work as expected.

But if I `su` then: backspace still works, but forward delete prints a tilde
and beeps.

At a BSD user group meeting, I got a workaround, which is to edit /root/.cshrc
and append:

bindkey "\e[3~" delete-char

I don't know what that means or why it helps, but it does.

I think it would be rather nicer if such a commonly used key worked as expected
out-of-the-box!

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