At 2:27 PM -0400 9/30/14, Lawrence Velázquez wrote:
On Sep 30, 2014, at 12:00 PM, Brandon Allbery <allber...@gmail.com> wrote:
On Tue, Sep 30, 2014 at 11:44 AM, Craig
Treleaven <ctrelea...@macports.org> wrote:
I have only rudimentary acquaintance with sed
and less with awk. I'd like to learn more and
this seemed like an opportunity to do so. From
some reading [1], I think sed's Hold buffer is
the way to extract the port name and insert it
onto the line with each of the variants. But
the tutorial only uses the hold buffer for
full lines; not just, say, the first word of
the line. Is this possible? How does one do
that?
Very, very painfully. I think I could do it,
with a LOT of fiddling, but would very much
prefer to use a more appropriate tool. awk is
somewhat better, but I'd reach for
perl/python/ruby first.
Yup. Sed is not a great tool for this sort of
thing; the functionality it provides is
ill-suited for complex conditionals and
branching. You'll regret writing the script as
soon as you go to read/edit it in a week or
month.
vq
---------->8----------
That being said, I have masochistic tendencies.
% port variants php53-mysql php54-mysql | sed -nf variants.sed
php53-mysql mariadb N
php53-mysql mysql4 N
php53-mysql mysql5 N
php53-mysql mysql51 N
php53-mysql mysql55 N
php53-mysql mysql56 N
php53-mysql mysqlnd Default
php53-mysql percona N
php54-mysql mariadb N
php54-mysql mysql4 N
php54-mysql mysql5 N
php54-mysql mysql51 N
php54-mysql mysql55 N
php54-mysql mysql56 N
php54-mysql mysqlnd Default
php54-mysql percona N
%
Attachment converted: Macintosh HD:variants.sed ( / ) (0342ACEF)
Thank you! Off list, I was pointed to a sample
Awk program* that reformats a 'billing report'.
That helped; you've given me a complete solution!
* http://www.programmingforums.org/post226750.html
APL used to have the reputation as a "write-only"
language. This script is pretty close to that
ideal. ;)
Craig
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