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Re: Zsh Guide chapter 5 (substitutions)
- X-seq: zsh-users 4128
- From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
- To: Peter Stephenson <pws@xxxxxxxxxxxxxxxxxxxxxxxx>, zsh-users@xxxxxxxxxx
- Subject: Re: Zsh Guide chapter 5 (substitutions)
- Date: Thu, 16 Aug 2001 02:31:50 +0000
- In-reply-to: <20010815230024.3E7F614284@xxxxxxxxxxxxxxxxxxxxxxxx>
- Mailing-list: contact zsh-users-help@xxxxxxxxxx; run by ezmlm
- References: <20010815230024.3E7F614284@xxxxxxxxxxxxxxxxxxxxxxxx>
On Aug 16, 12:00am, Peter Stephenson wrote:
} Subject: Zsh Guide chapter 5 (substitutions)
}
} The main addition is chapter 5, which talks about all forms of shell
} substitutions and expansions. Chapter 3 has been slightly edited. I'd
} be interested in any comments on either, of course. It's possible
} chapter 3 is a little indigestible and I could move some of the
} marginalia to a later chapter or appendices or whatever.
Here's something I noticed in Chapter 3:
---------------
./myscript 2> >(grep -v idiot >error.log) |
process-output >output.log
a little abstract, but here the main point of the script `myscript'
is to produce some output which undergoes further processing on the
right-hand side of the pipe. However, we want to process the error
output here, by filtering out occurrences of lines which use the word
`idiot', before dumping those errors into a file error.log. So we get an
effect similar to having two pipelines at once, one for output and one
for error. Note again the two `>' signs present next to one another to
get that effect. Don't remove the space between them, either: for what
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
that will do, and for more on the meaning of `2>', see the section on
redirections, below.
---------------
I don't know what you're driving at, there. 2>>(thing) and 2> >(thing)
are exactly equivalent. However, 2>(thing) is the same as 2 >(thing),
and not the same as 2> (thing), which is a syntax error that I've never
seen before in ten years of using zsh ("missing end of name").
I may have some remarks about chapter 5 when I get there ...
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net
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