RE: Grep and matching end of line (anchoring)

["Dave Korn" <dk at artimi dot com>]

> -----Original Message-----
> From: cygwin-owner On Behalf Of Buchbinder, Barry (NIH/NIAID)
> Sent: 19 November 2004 18:53

> >> This should work whether or not one is on a text mount or for
> >> the file has DOS or Unix line endings:
> >> 
> >> 	cat files.txt | grep -E '\.h^M?$'
> >
> >   Always test before posting.  Even a one liner.  That doesn't work,
> > or at least NFM:

> I tested by cat-ing a batch file and it worked for me.  I did 
> not put the
> two character "^" and "M" in.  In bash I put a control-M by hitting
> control-V and then <enter>.  The console showed the two 
> character ^M and I
> just copied the console screen to the email.  

  Wow, that's interesting, and very very useful.  I'd never heard of lnext
until now!  Of course if you press ctrl+M, it sends the line; same if you
press ALT+013.

> I used the word "should" because I did not test in all 
> combinations of text
> and binary mounts and line endings.  I'm sorry if that choice 
> of word was too ambiguous or subtle.

  No, that word had nothing to do with my misunderstanding.  It was entirely
because of this bit:

> I did not think that grep understood ^M -- I assumed that the 
> readers in
> this list would understand it.  Personally I've never seen 
> the two character
> ^M used for inputting a \r.  

  ^ notation is the standard used by stty for describing control chars.  I'm
not sure what other apps may or may not speak it, but that's why I thought
that was what you were attempting.

>  It has, in my experience, always 
> been used to
> indicate a \r in output or when viewing a file in a hex 
> editor so I thought
> that it would be understood.  I apologize for not being explicit.

  Apologies aren't necessary, but explanations are wonderful things!


    cheers, 
      DaveK
-- 
Can't think of a witty .sigline today....


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/