Re: grep by paragraph

[Dave Cross <davorg@xxxxxxxxx>]

On 30 August 2013 10:38, Dave Mitchell <davem@xxxxxxxxx> wrote:

On Fri, Aug 30, 2013 at 10:50:31AM +0200, Timothy Murphy wrote:
> that will print out a whole paragraph -
> defined as the section between two blank lines -
> containing a given word or phrase?
>
> Such as the above 4 lines.
> If not, can anyone suggest a simple script that will do this?

The perl one-liner below demonstrates this. Setting the $/ (input record
separator) var to the empty string causes perl to read in "lines" a
paragraph at a time.

    $ perl -e'$/=""; while (<>) { print if /green/ }' /tmp/text

You can use Perl's command line options to clean that up a bit.

$  perl -00 -ne 'print if /green/' para.txt

-00 is the same as $/=""

-n is the same as "while (<>) { YOUR CODE HERE }"

See "perldoc perlrun" (http://perldoc.perl.org/perlrun.html) for details.

--
Dave Cross :: dave@xxxxxxxxxxx
http://dave.org.uk/
@davorg

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