sed syntax

[colin davidson]

I think you're missing backslashes in front of the opening and closing
parentheses, but it's been around 30 years since I last used sed, so I
could easily be wrong.

Colin

On 2/3/09, Matt Price <matt.price-H217xnMUJC0sA/PxXw9srA at public.gmane.org> wrote:
> ok
>
>  after all these years with linux i still have all kinds of trouble with
>  regexp's.  i have a file full of error messages from dmesg:
>
>  [125559.165041] Buffer I/O error on device sda5, logical block 19698429
>
>  (i know, it's not a good sign; i'm just trying to hang onto this drive
>  for a little longer)
>
>  i want to cut these lines back so i just have the block number:
>  19698429
>
>  now, i know i can do that with 'cut -d " " -f 10', but my first impulse
>  was to do it with sed, and i, as usual, don't understand what i'md doing
>  wrong.  since i just want the final 8-digit block number, i thought i
>  could do this:
>  cat file | sed 's/(^.*)([0-9]*$)/\2/'
>
>  but that returns the initial file unmodified.
>
>  any ints out there?  thanks as always,
>
>  matt
>
>
>  --
>  Matt Price
>  matt.price-H217xnMUJC0sA/PxXw9srA at public.gmane.org
>
> --
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