Date: Tue, 7 Nov 2017 21:20:40 +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: <c00693b7-ae1b-4aa8-49e2-81296cfb281f@gmx.com> In-Reply-To: <88b1870184a8810072fe503917cd86be.squirrel@webmail.harte-lyne.ca> 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>
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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.
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