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From: "Dalton, Barnaby" <Barnaby DOT Dalton AT radioscape DOT com>
To: "'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject: RE: Grep and matching end of line (anchoring)
Date: Mon, 22 Nov 2004 10:15:01 -0000
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Thanks for all the replies. In practice I am using grep on the output of a
DOS utility rather than via cat (sorry for the bad example). So I was
originally writing something like:

doscommand | grep '\.h$'

I imagine its fairly common usage to want to pipe DOS command output to
cygwin utilities. Although its pretty simple to use perl/sed/tr filer in the
middle it would be nice if cygwin came with a script that did this so that I
could write something like:

doscommand | dos2unix | grep '\.h$'

I just typed 'dos2unix' on the command line and discovered that it already
exists in cygwin and does exactly what I need! So my problem is already
solved :-)

Barney

$ dos2unix --help
dos2unix version 0.1.2
  converts the line endings of text files from
  DOS style (0x0d 0x0a) to UNIX style (0x0a)

Usage: dos2unix [OPTION...] [input file list...]

Main options (not all may apply)
  -A, --auto         Output format will be the opposite of the autodetected
                     source format
  -D, --u2d          Output will be in DOS format
  --unix2dos         Output will be in DOS format
  -U, --d2u[=2]      Output will be in UNIX format
  --dos2unix[=2]     Output will be in UNIX format

Help options
  -?, --help         Show this help message
  --usage            Display brief usage message
  --version          Display version information
  --license          Display licensing information

Other arguments
  [input file list...]       for each file listed, convert in place.
                             If none specified, then use stdin/stdout

> -----Original Message-----
> From: Buchbinder, Barry (NIH/NIAID) [mailto:BBuchbinder AT niaid DOT nih DOT gov]
> Sent: 19 November 2004 15:17
> To: 'cygwin AT cygwin DOT com'
> Subject: RE: Grep and matching end of line (anchoring)
> 
> 
> At Friday, November 19, 2004 7:41 AM, Reini Urban wrote:
> > Dalton, Barnaby schrieb:
> >> I'm having trouble getting grep to match end of line when used with
> >> files/utilities that use DOS linefeeds. For example:
> >> 
> >> cat files.txt | grep '\.h$'
> >> 
> >> produces no output. However, if I stick a filter in the middle to
> >> change the line endings: 
> >> 
> >> cat files.txt | perl -pe 's/\r\n/\n/' | grep '\.h$'
> >> I get:
> >> 
> >> file1.h
> >> file2.h
> >> 
> >> as expected.
> > 
> > pipes are treated as binmode, so they don't convert eol from \r\n to
> > \n. without pipe it should work on a textmount:
> > 
> >      grep '\.h$' files.txt
> > or  grep '\.h$' < files.txt
> > 
> >> Should grep's $ match \r\n or should I expect to have to 
> convert line
> >> endings?
> > 
> > grep's "$" is not expected to do textmode magic if stdin is binmode.
> > 
> > BTW:
> >    cat files.txt | sed 's,\r\n,\n,' | grep '\.h$'
> > is simpler.
> > 
> > Someone might think of a new textmode pipe operator (like a 
> new "t|"),
> > but I don't consider that a good idea.
> > man bash /REDIRECTION and /Pipelines
> > --
> > Reini Urban
> > http://xarch.tu-graz.ac.at/home/rurban/
>  
> Assuming that \r never occurs in the middle of a line:
> 	cat files.txt | tr -d '\r' | grep '\.h$'
> 
> This should work whether or not one is on a text mount or for 
> the file has
> DOS or Unix line endings:
> 	cat files.txt | grep -E '\.h^M?$'
> 
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