Date: Fri, 29 Mar 2002 16:40:26 -0800 From: Matthew Hunt <mph@astro.caltech.edu> To: esoha@attbi.com Cc: ports@freebsd.org Subject: Re: Bento errorlogs and /dev/fd/* Message-ID: <20020329164026.B81336@wopr.caltech.edu> In-Reply-To: <20020330003458.DONW1214.rwcrmhc54.attbi.com@rwcrwbc57>; from esoha@attbi.com on Sat, Mar 30, 2002 at 12:34:57AM %2B0000 References: <20020330003458.DONW1214.rwcrmhc54.attbi.com@rwcrwbc57>
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Hi again Eyal,
On Sat, Mar 30, 2002 at 12:34:57AM +0000, esoha@attbi.com wrote:
> cat rock.* | gzip -dc | book create /dev/stdin 60 3 |
> crafty
No, "book create" is not a shell command, it is a crafty command.
That is, crafty's stdin can consist *only* of the line "book create ..."
The unzipped rock.* must also be provided to crafty, but not on stdin.
> As I see it, if each step has one input and one output,
> stdin and stdout should be enough. No?
No, crafty has two inputs, the command ("book create foo 60 3") which
has to be on stdin, and the output of "cat rock.* | gzip -dc" which has
to be somewhere else, and is the "foo" in the "book create" command.
If you had a very big disk, the naive and simple thing to do is:
cat rock.* | gzip -dc > enormous-file
echo "book create enormous-file 60 3" | crafty
rm enormous-file
However, this requires 300+ MB of disk space more than it really needs
to, and is slower.
Matt
--
Matthew Hunt <mph@astro.caltech.edu> * Stay close to the Vorlon.
http://www.pobox.com/~mph/ *
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