Ah,, Thanks for your reply. Mike
> On Fri, Oct 18, 2019 at 7:30 AM Digital2015 Life
> <digital2015.l...@yandex.com> wrote:
>
>> The bug is about {n,m} regular expression in ed.
>>
>> ed does not recognize 0 in {n,m} which it should.
>
> If you read the Posix spec
> <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/ed.html>, you'll
> see that the addresses of lines are positive numbers. Address 0 is only valid
> in six specific places:
>
> 0a means "insert at the beginning at the buffer"
> 0,nc is the same as 1,nc for historical reasons
> 0i is the same as 1i for historical reasons
> m,nm0 means "move lines to before
>
> the beginning at the buffer"
> 0r means "read file and insert it at
>
> the beginning at the buffer"
> m,nt0 means "copy lines to before
>
> the beginning at the buffer"
>
> As you can see, the s command is not included.
>
> The GNU ed manual
> <https://www.gnu.org/software/ed/manual/ed_manual.html#Commands> says the
> same things, except that it doesn't mention address 0 for the c command
> (though it does work as above).
>
> John Cowan http://vrici.lojban.org/~cowan co...@ccil.org
> Dream projects long deferred usually bite the wax tadpole.
> --James Lileks
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