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 <[EMAIL PROTECTED]>:
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.
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