On Sep 30, 2014, at 12:00 PM, Brandon Allbery <[email protected]> wrote:
> On Tue, Sep 30, 2014 at 11:44 AM, Craig Treleaven <[email protected]> > 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 %
variants.sed
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