[CentOS] question on grep

[Ross S. W. Walker]

Stephen Harris wrote:
> 
> On Wed, Oct 10, 2007 at 04:10:05PM -0400, Ross S. W. Walker wrote:
> > Stephen Harris wrote:
> > > 
> > > On Wed, Oct 10, 2007 at 04:32:30PM -0300, mups.cp wrote:
> > > > A simple one
> > > > # echo "jerry jerry" | tr " " "\n" | grep -c jerry
> > > > 2
> > > 
> > > But what about jerry.jerry or jerry/jerry or jerry,jerry or....
> > 
> > Well he never stated a non-standard field separator, but if 
> that is the case, with awk:
> 
> The question wasn't suficiently well defined.  After all, is 
> "jerryjerry"
> a count of "1" or "2" ?  :-) :-)
> 
> To make the "tr" case more general:
>   echo "jerry jerry" | tr -c '[:alnum:]' '\012' | grep -c jerry
> 
> Or we could be silly (if each occurance is meant to be counted):
>   echo "jerry jerryjerryjerryhellojerry" | sed 's/jerry/\
>   jerry/g' | grep -c jerry

True!

Regular expressions sure are fun :-)

I think we've shown enough variations here to give the OP the
idea that there are a lot of ways to skin this cat.

-Ross

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