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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