Re: How to filter out lines?

Viatly wrote:
> Given a stdout of some prog, I have to filter out 2-line blocks of
> text, where the first line contains "marker1" and the second line
> contains "marker2".
> Thus, for the following output
> 
> some text..
> more text...marker1...moretext
> more text...marker2...moretext
> more text..
> more text...marker1...moretext
> more text..
> more text...marker2...moretext
> more text...
> 
> after applying the filter I shell get
> 
> some text..
> more text..
> more text...marker1...moretext
> more text..
> more text...marker2...moretext
> more text...

$ echo "some text..
more text...marker1...moretext
more text...marker2...moretext
more text..
more text...marker1...moretext
more text..
more text...marker2...moretext
more text..." | \
     perl -ne'/marker1/ and $_ .= <> and /marker2/ and next; print'
some text..
more text..
more text...marker1...moretext
more text..
more text...marker2...moretext
more text...




John
-- 
Perl isn't a toolbox, but a small machine shop where you
can special-order certain sorts of tools at low cost and
in short order.                            -- Larry Wall