Walt Mankowski via plug on 12 Jun 2023 06:32:50 -0700


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Re: [PLUG] How to Eliminate a CR-LF-Space 3-Character Sequence from a Text File?

You can also do this in Perl of course. It's unclear to me whether Casey wants to completely remove the CR-LF-Space sequence or replace it with just a LF. To remove it, use

perl -0777 -pe 's/\r\n //g'

To replace it with a line feed, use

perl -0777 -pe 's/\r\n /\n/g'

The -pe flags together tell Perl to read in every line of stdin and apply a regular _expression_ to them. The -0777 flag tells it to slurp in the entire stream as a single line. The regex replaces the CR-LR-Space sequence globally with either nothing or a newline.

Walt

On Mon, Jun 12, 2023 at 09:03:34AM -0400, Aaron Mulder via plug wrote:
> There's a Stack Overflow question with several possible answers (obscure
> sed syntax, workarounds, Perl, etc.) but here's the answer that looks
> simplest for GNU sed:
> 
> https://unix.stackexchange.com/a/525524
> 
> Thanks,
>        Aaron
> 
> 
> On Mon, Jun 12, 2023 at 8:23 AM Casey Bralla (Mail List) via plug <
> plug@lists.phillylinux.org> wrote:
> 
> > I'm trying to manipulate my on-line caldav calendar data, but am having
> > trouble with some of the formatting of the raw calendar file.  I need
> > help in removing a CR-LF-Space 3-character sequence from the downloaded
> > file.
> >
> > I'm using a wget command to download the calendar file, which works
> > well.  Unfortunately, when caldav dumps the "DESCRIPTION" element, it
> > limits it to 72 columns, and adds a CR-LF-Space to continue the data
> > field.  I'm looking for a way to eliminate this 3-character sequence
> > from the wget'd file.  If I could do that, each data element would be on
> > a single line, and very easy to parse and manipulate.
> >
> > My first thought was to pipe wget through sed, but sed deals with
> > individual lines, and so it never sees the CR-LF-Space sequence on a
> > single line and therefore can't do a substitution on it.
> >
> > I could also write a python script to edit the data, but that seems too
> > complicated.  I assume there must be a simple way to edit this sequence
> > using a sed-equivalent that works on entire files, not just individual
> > lines.  Ideally, I'd do this as a piped operation when I wget the file.
> >
> > How can I easily (simply) search and replace a CR-LF-SPACE 3-character
> > sequence from a text file using the command line?
> >
> > TIA!
> >
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