Re: Un-POSIX-like behavior of join command

Brennan Vincent wrote:

> When joining a line that is followed by an empty line (or one with only
> spaces), POSIX specifies that it should be deleted without the current
> line being affected. See the section "Join" in
> https://pubs.opengroup.org/onlinepubs/9699919799/ .
>
> However, vim appends a space to the current line in this case. For
> example, if line 1 is "foo", and line 2 is blank, after executing :1j
> line 1 will be "foo ", as can be seen by executing the following (`ex`
> is provided by `vi` on my system)
>
> $ echo -e 'foo\n' > test.txt && echo -e '1j\nwq' | ex test.txt && wc -c
> test.txt
> 5 test.txt
>
> nvi/nex give the POSIX behavior:
>
> $ echo -e 'foo\n' > test.txt && echo -e '1j\nwq' | nex test.txt && wc -c
> test.txt
> 4 test.txt
>
> Is this a bug, or intentional?

I can't think of a reason why it works this way. And the trailing space
is useless. So we should call it a bug.

What should happen if the second line is blank, not empty?

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