Re: how to find lines containing two null characters?

[Brad <lists@anomie.dhis.org>]

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On 9 Sep 1999, Mark Buda wrote:

> I want to do what
> 
> egrep '\000\000' files...
> 
> would do if egrep understood \NNN octal escape sequences. Is there
> something I'm missing in the egrep man page that would permit this? If
> not, is there some package among the bazillions of Debian packages
> that contains a program that will do this? (I've looked, but found no
> suspects.)

Behold, the power of Perl!

This one-liner should do it for you. You can either cat the file and pipe
it into this, or you can tack the filename on at the end.

  perl -ne '/\000\000/ and print;'

In this form it won't print the filename before each line if you specify
more than one file, the way grep will. That takes a slightly longer
one-liner:

  perl -ne '/\000\000/ and print "$ARGV:$_";'

Or, if you want the exact behavior of grep, only printing if more than one
file is specified:

  perl -e '$f=@ARGV; while(<>){ /\000\000/ and print $f>1?"$ARGV:$_":$_ }'


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