On Wed, 24 Mar 2010 13:06:12 -0700 Philip Guenther wrote: > 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'
right. This one looks nicer. > 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' sed -E !?! Great! Now I know why I upgraded to -current.
