Sunday, August 01, 2010

» Shell trick: CRLF to LF

I do this again and again in RPM .spec files, so just in case: a little trick to remove the CR from CRLF ;) (Windows uses two bytes for end-of-line markers, namely CR and LF, while Linux and Unix only use one: LF) You might of course use dos2unix or recode, but this one works in-place, which means that you don't need to make a copy, work on the copy and then copy (heh) that file back onto the original -- here is how to do it with dos2unix:
cp file file.orig && dos2unix file
And here the shorter version, using sed and its in-place editing feature:
sed -i 's/\r$//' file
Might as well do it with Perl, which also supports in-place editing:
perl -pi 's/\r$//' file
Update: as _Marcus_ just told me, recode actually does in-place editing by default, my bad :)

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Blogger DimiG said...

Thank you for your tips!

Blogger Sagi. said...

btw: dos2unix works in-place as well.

Blogger Dave said...

I often need to identify which files in a directory contain CRLFs that need changing to LF. I use the file command to do this:

$ file *.cxx
one.cxx: ASCII C program text
two.cxx: ASCII C program text, with CRLF line terminators

Blogger Peter C. Ndikuwera said...

dos2unix also does inplace editing.


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