grep for ascii nul

[Kurt Hackenberg]

On 2019-11-01 06:20, Polytropon wrote:

> I don't know if the declaration "text/x-csrc" is processed
> by the mailing list as regular text attachment, but as
> you said, "text/plain" should work. Stripping non-text
> attachments (especially binary ones, like images) has
> been common practice on this list for years, probably
> for decades now.

Sure enough, my mail reader (Thunderbird) generates a C source 
attachment as text/x-csrc. I didn't know that type existed. Obviously 
it's non-standard.