On Wed, Mar 24, 2010 at 10:17 AM, Christopher Zimmermann
<madro...@zakweb.de> wrote:
> On Wed, 24 Mar 2010 19:00:06 +0200 Gregory Edigarov wrote:
>> Just wonder how could one implement what gnu grep -o flag does using
>> our toolchain?
>>
>> from ggrep(1):
>>
>> -o, --only-matching
>> Show only the part of a matching line that matches
>> PATTERN.
>
> maybe try this:
> sed -n -e 's/.*\(PATTERN\).*/\1/ -e /PATTERN/p
Hmm, missing quote, and the expressions can be combined, but as a
portable solution this is indeed the right answer.
sed -n -e 's/.*\(PATTERN\).*/\1/p'
If you need extended (egrep-style) regexps, then the most portable
solution is a chunk of awk (left as an exercise for the student); the
less-portable-but-works-in-4.7 solution is to use -E option to sed:
sed -n -E 's/.*(PATTERN).*/\1/p'
Philip Guenther
