Date: Tue, 07 Nov 2017 11:34:31 -0700 From: JD <jd1008@gmail.com> To: freebsd-questions@freebsd.org Subject: Re: sed - remove nul lines from file Message-ID: <5A01FCB7.9070201@gmail.com> In-Reply-To: <e24f74746e30761fa7bfe5ba62d5495c.squirrel@webmail.harte-lyne.ca> References: <b21bf201363c34a90ab55c4a05ff8fd7.squirrel@webmail.harte-lyne.ca> <c7a8f2d2-493a-6a34-efa5-570f00b5a988@tundraware.com> <e24f74746e30761fa7bfe5ba62d5495c.squirrel@webmail.harte-lyne.ca>
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On 11/07/2017 11:05 AM, James B. Byrne via freebsd-questions wrote: > On Tue, November 7, 2017 12:46, Tim Daneliuk wrote: >> On 11/07/2017 11:12 AM, James B. Byrne via freebsd-questions wrote: >>> I have a data file created by an ancient proprietary scripting >>> language called QTP. There is a bug in this program which, on >>> occasion, manifests itself by inserting output records consisting >>> entirely of nul (^@) (\x00) bytes at regular intervals. In the >>> present case every 47th. record consists entirely of nuls. >> <snip> >> >> I don't have the magic off the top of my head, but this might be a >> good job for 'tr'... > I have not found a way to get tr to actually delete the lines. > Getting rid of all the nul characters I can do using three different > ways that I know of. What I want to get rid of is the entire line. > What version of linux r u using. I have a few fedora machines from F20 to current f27 on all of them, tr -d works just fine. To wit: $ cat -v /tmp/x ################################################ ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^ $ tr -d '\000' < /tmp/x > /tmp/x2 $ cat -v /tmp/x2 ################################################
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