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Re: Grep and matching end of line (anchoring)


Dalton, Barnaby schrieb:
I'm having trouble gettting grep to match end of line when used with
files/utlilities 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 simplier.

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/


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