Thorsten Glaser wrote:
> Jonathan Nieder dixit[1]:
>> <( ... ) - runs ... in a subshell in the background, with its
>> output connected to a pipe.
[...]
>> On Linux and similar OSes this is typically implemented using
>> /proc/fd. A more portable implementation would use FIFOs.
>
> I don’t know whether this works on all mksh target OSes, but
> that can surely be investigated.
[...]
> <(…) is already on the wishlist – if you want to submit a
> patch, you’re welcome ;-) it should work on DEC ULTRIX 4.5,
> DEC OSF/1 V2.0, Minix 3, Haiku, Cygwin, UWIN, etc. though,
> and, if possible, Plan 9. ☺
Ha. mkfifo was part of POSIX.1-1988, so it should be fairly
portable.
- Ultrix and OSF/1 2.0: has mkfifo.
- Minix 3: ought to have mkfifo (claims POSIX compliance).
- Haiku: has mkfifo
- Cygwin: has /proc/self/fd
- UWIN: complicated? The ast-ast library supports /dev/fd,
but native Windows apps obviously don't.
- Plan 9: has devdup[2]. "bind #d /dev/fd" and you're good to go.
It's on my list now. :)
>> This construct is also handy when one wants to update the current
>> environment downstream from some other process.
>
> process |&
> while IFS= read -pr line; do
> …
> done
Nice. I had been hoping for something like that.
> A side note, I’d like to track upstream feature requests
> *not* inside the Debian BTS. We usually use the MirBSD
> mailing list
Thanks for a pointer. I'll report straight here from now on (perhaps
along with reports to Debian with an appropriate "Forwarded:"
pseudo-header).
[1] http://bugs.debian.org/606821
[2] http://plan9.bell-labs.com/magic/man2html/3/dup
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