Re: [gentoo-user] OT: sed on the commandline

[Etaoin Shrdlu]

On Sat, 12 Feb 2011 14:11:20 +0100
meino.cramer@×××.de wrote:

> Alan McKinnon <alan.mckinnon@×××××.com> [11-02-12 13:44]:
> > Apparently, though unproven, at 13:25 on Saturday 12 February 2011,
> > meino.cramer@×××.de did opine thusly:
> >
> > > Hi,
> > >
> > >  I am trying to instruct sed to insert a line of text before
> > >  a matched line. The whole command should fit into one
> > >  physical (command) line.
> > >
> > >  Is it possible? And how is it possible?
> > >
> > >  Thank you very much for any hint in advance!
> > >  Best regards,
> > >  mcc
> >
> >
> > There's nothing special about a line, it's just a bunch of characters
> > that end with a newline (itself just a character).
> >
> > But you can't insert stuff at arbitrary points, you can only replace
> > stuff with other stuff. You can replace the start of line marker (^),
> > so do this:
> >
> > $ cat sed.txt
> > 1
> > 2
> > $ cat sed.txt | sed -e 's/^/a\n/g'
> > a
> > 1
> > a
> > 2
> >
> > I replaced "start of line" with "a and a newline". Modify the regex to
> > suit your needs. This gets awkward though, as you can search with a
> > regex but only replace a literal. If you need to insert some line
> > before any line containing say a "z" for example, then that is way
> > beyond sed's capabilities and you are into awk|perl territory.
> >
> > You didn't clearly state what you are trying to do with examples, so
> > the above vague wishy-washy goop is the best I can do for you.
> >
> >
> > --
> > alan dot mckinnon at gmail dot com
> >
>
> Hi,
>
> I update my MakeHuman svn source and the Blender svn source on a daily
> basis. Currently the Blender folks did a change in the registration
> code for Blender scripts. The MakeHuman folks provide a script, which
> is needed to load the putput of MakeHuman into Blender. This script
> isn't "new registration ready".
>
> I have to do the following the changes to the Makehuman script (a
> handfull):
>
> change this: =======================================
> def registration()
>     <script specific stuff
>
>
> def unregistration()
>     <script specific stuff
>
> into this: =========================================
> def registration()
>     bpy.utils.register_module(__name__)
>     <script specific stuff
>
>
> def unregistration()
>     bpy.utils.unregister_module(__name__)
>     <script specific stuff
>

So it looks like you have to add a line *after* a match, not before as you
originally said. Try this then:

sed '/matchingline/s/$/\ninsertedline/'

which in your case will likely be something like

sed '/def registration()/s/$/\nbpy.utils.register_module(__name__)/'

you can do both insertions in a single sed script, eg

sed '/def registration()/s/$/\nbpy.utils.register_module(__name__)/
     /def unregistration()/s/$/\nbpy.utils.unregister_module(__name__)/'