Re: [gentoo-user] About sed

[Rafael Barreto]

:) Thanks very much.

Now that I read your answear I searched in a book the significant of *,+ and
others and I suppose I understood.

Thanks

2005/11/7, Willie Wong <wwong@×××××××××.edu>:
>
> On Mon, Nov 07, 2005 at 01:44:42AM -0200, Rafael Barreto wrote:
> > Hi,
> >
> > I'm learning about the use of the sed command and I have some questions.
> I'm
> > trying to read in /etc/conf.d/clock the CLOCK variable with:
> >
> > sed '/^CLOCK="*"$/p' /etc/conf.d/clock
> >
> > This command, in principe, must print in screen the line that contains
> > CLOCK= in the begin, contains anything between double quotes and ends.
> Well,
> > this doesn't return anything. If I enter the above command without $,
> all is
> > ok. But, if I would like to return just that line contains
> CLOCK="anything"
> > and nothing more? For example,
>
> No it doesn't. What you want is the regexp ^CLOCK=".*"$ if you want
> anything (including nothing) between the double quotes, or
> ^CLOCK=".+"$ if you want something (excluding nothing) between the
> double quotes.
>
> The reason that removing the trailing $ worked is that it matched the
> CLOCK=" part, the * character specifies 0 or more iterates of the
> previous character, which is "
>
> HTH
>
> W
> --
> Q: Why won't Heisenberg's operators live in the suburbs?
> A: They don't commute.
> Sortir en Pantoufles: up 4 days, 5:24
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