Date: Tue, 7 Nov 2017 21:28:22 +0300 From: Yuri Pankov <yuripv@gmx.com> To: byrnejb@harte-lyne.ca Cc: freebsd-questions@freebsd.org Subject: Re: sed - remove nul lines from file Message-ID: <656b08b1-b79d-8e7e-27ec-e39d883f2355@gmx.com> In-Reply-To: <c00693b7-ae1b-4aa8-49e2-81296cfb281f@gmx.com> References: <b21bf201363c34a90ab55c4a05ff8fd7.squirrel@webmail.harte-lyne.ca> <88a59a82-2902-9f63-0a94-bd23b910e7ad@gmx.com> <c2b1ffce6933bcb8f47c856a40d29b16.squirrel@webmail.harte-lyne.ca> <f51d6c8a-c91c-dc7c-6134-e276ec60b179@gmx.com> <88b1870184a8810072fe503917cd86be.squirrel@webmail.harte-lyne.ca> <c00693b7-ae1b-4aa8-49e2-81296cfb281f@gmx.com>
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On Tue, 7 Nov 2017 21:20:40 +0300, Yuri Pankov wrote:
> On Tue, 7 Nov 2017 13:14:08 -0500, James B Byrne Via Freebsd-questions
> wrote:
>>
>> On Tue, November 7, 2017 13:03, Yuri Pankov wrote:
>>
>>>
>>> You want /d, not /g, to delete the *lines* which contain NUL symbols
>>> (that's what your subject line said).
>>>
>>
>> Sigh. Thank you. That works. However, it also deletes any line that
>> has even one NUL in it regardless of the presence of other non-nul
>> characters on the line.
>>
>> What I wish to accomplish is to delete only the lines that are
>> completely nul. I thought that this could be accomplished by
>> prefacing the match sting with the start of line anchor ^ and ending
>> it with the end of line anchor $ but this does not work as I expect.
>
> "[[.NUL.]]" is just a character specified by its collation name, so
> treat as any other ordinary character:
>
> sed -E '/^[[.NUL.]]+$/d' INFILE > OUTFILE
>
> Need extended regexp here for '+' to work.
Or, after looking at re_format(7), it could be written using BREs, your
choice :-)
sed '/^[[.NUL.]]\{1,\}$/d'
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