[clug] Circumflex

[Scott Ferguson]

On 21/08/17 04:21, Bryan Kilgallin (iiNet) via linux wrote:
> Thanks again Scott:
> 
> The problem was with the sample text file. I think that some unfortunate
> CR/LF line-ending combination had caused trouble.

You can test for dos text files in a directory with:-
grep -lU $'\x0D' *

(which matches on the hex for CRLF)

or grep a file for a line that end with a carriage return:-
[[ $(grep -c $'\r$' crlf.txt) -gt 0 ]] && echo dos

or use dos2unix to check a directory of text files:-

dos2unix -ic *.txt
  ASP_xp.txt
  crlf.txt

Of course "file" will also tell you whether it's a MS-DOS-style text file:-
file crlf.txt
crlf.txt: ASCII text, with CRLF line terminators


You can pipe through "dos2unix" (which converts MS-DOS-style text files
to UNIX-style text files)

e.g.:-
cat crlf.txt |grep }$
#fails

cat crlf.txt|dos2unix |grep }$
        guidExtensionCode         {7033f028-1163-2e4a-ba2c-6890eb334016}
        guidFormat
{59555932-0000-1000-8000-00aa00389b71}
        guidExtensionCode         {82066163-7050-ab49-b8cc-b3855e8d221e}
        guidExtensionCode         {82066163-7050-ab49-b8cc-b3855e8d221f}
        guidExtensionCode         {82066163-7050-ab49-b8cc-b3855e8d2252}
        guidFormat
{59555932-0000-1000-8000-00aa00389b71}
#succeeds

or use "sed" to change the line endings:-

sed 's/\r$//'

and then there's awk and perl (which will do the same thing)...



> 
> Whereas with a different sample text file, the grep operations worked fine!

grepping MS-DOS-style text files is a bit tricky (depending on your
version of grep).
Normally grep guesses if the file is text - and ignores the carriage
returns if it guesses the file is text. You can override this with -U
which forces grep to treat the file as binary and read the carriage returns.
https://explainshell.com/explain?cmd=grep+-U


Kind regards




-- 
    A: Because we read from top to bottom, left to right.
    Q: Why should I start my reply below the quoted text?

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    Q: Why is top-posting such a bad thing?

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    Q: Should I trim down the quoted part of an email to which I'm reply

http://www.idallen.com/topposting.html