Re: Post-grep-like operations

*grumble* This was supposed to go to the list, not straight to Rob.
Gmail does not like certain mailing lists for some reason.

On 12/10/05, Rob Simpson <Rob.Simpson@xxxxxxxxxxxxx> wrote:
>
> I am wanting to select lines containing 'fruit' or 'veg', and then carry out 
> some operation on them, say substitution X for a.
<SNIP>
> I am trying to do this in a sed file:
>
> /fruit/b
> /veg/b
> d
> s/a/X/g
>
> using the grep like command in the one-liners document.
>
> The last expression doesn't get carried out.  I guess something is happening 
> with the buffer, but do not understand what. I can't find '/b' in the 
> documentation.

>From the man page on my system:
[2addr]b[label]
            Branch to the ``:'' function with the specified label.  If the
            label is not specified, branch to the end of the script.

So b will either branch to the end of the file or to a label.  Your
script is branching to the end of the file since there is no label.
Add a label, say sub, right after the b and then add a label, :sub:,
on a line before the substitution command. Your script will then look
like this:

/fruit/bsub
/veg/bsub
d
:sub
s/a/X/g

When searching man pages some times it pays to read them instead of
searching for a string. There is a large quantity of useful
information in most man pages that you will miss if you just search
for strings.

--
Lorance Stinson
http://www.flickr.com/photos/lorancestinson/
http://lorance.freeshell.org/


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