Date: Fri, 15 Jul 2005 00:09:46 -0400 From: Paul Chvostek <paul+fbsd@it.ca> To: hzs202@nyu.edu Cc: Dan Nelson <dnelson@allantgroup.com>, freebsd-questions@freebsd.org Subject: Re: Problem Piping iostat -c to awk! Message-ID: <20050715040946.GA4827@it.ca> In-Reply-To: <42D730EB.6070905@gmail.com> References: <42D7236A.6010803@gmail.com> <20050715032319.GA98600@dan.emsphone.com> <42D730EB.6070905@gmail.com>
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On Thu, Jul 14, 2005 at 11:43:39PM -0400, Hakim Singhji wrote:
>
> | iostat -c 300 1 | awk '!/[a-zA-Z]|^$/ {print $1}'
>
> This doesn't seem to work for me... awk tells me:
>
> awk syntax error at source line 1
> ***
> /[a: Event not found.
That's because you're using tcsh, and the exlcamation point is being
interpreted as part of a shell history reference. You can turn this
into a shell *script*, or just run it in bash or /bin/sh. Or if you
absolutely must run it in csh/tcsh, escape the ! with a \ (yes, even
inside single quotes).
> Not sure how to allow awk to delete two top rows of iostat... other that
> the grep option -v. Does not seem to be working in awk.
You could try something like:
iostat -c 300 | awk 'BEGIN {getline;getline;} $1~/^[0-9]+$/ {print $1}'
or for something even lighter-weight:
iostat -c 300 | sed -Ene 's/^ +//;s/ .*//;/^[0-9]+$/p'
--
Paul Chvostek <paul@it.ca>
it.canada http://www.it.ca/
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