Re: OT: minimum bs for dd?

From	Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups	linux.debian.user
Subject	Re: OT: minimum bs for dd?
Date	2021-05-17 00:40 +0200
Message-ID	<CfxAx-7ko-21@gated-at.bofh.it> (permalink)
References	(1 earlier) <Cf9eN-1co-3@gated-at.bofh.it> <Cft3P-4x9-1@gated-at.bofh.it> <CftQd-527-1@gated-at.bofh.it> <CftZT-55d-3@gated-at.bofh.it> <CfwEq-6M4-5@gated-at.bofh.it>
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>> On Sun, May 16, 2021 at 01:31:49PM -0500, Richard Owlett wrote:
>> > I'll bite ;}
>> > When is it the right tool?
>> 
>> When you're using it to convert ebcdic to ascii, while swapping bytes and
>> reblocking an ancient file from a barely readable archival tape.
>> 
>> > When is it not?
>> 
>> When copying a file.
>> 
> When copying a file and writing it to another medium, perhaps eg when writing
> a DVD .iso file directly to a USB stick, it's ideal.

Not sure about ideal:

    cat <foo.iso >/dev/sdb

is one char longer than

    dd <foo.iso >/dev/sdb

but it's often faster (you can speed up `dd` by providing a larger
`bs=` argument, but then you've lost the length advantage ;-)


        Stefan

Thread

OT: minimum bs for dd? Bob Bernstein <poobah@ruptured-duck.com> - 2021-05-15 22:30 +0200
  Re: OT: minimum bs for dd? The Wanderer <wanderer@fastmail.fm> - 2021-05-15 22:40 +0200
  Re: OT: minimum bs for dd? IL Ka <kazakevichilya@gmail.com> - 2021-05-15 22:40 +0200
    Re: OT: minimum bs for dd? Bob Bernstein <bob@fanatick.org> - 2021-05-16 09:40 +0200
    Re: OT: minimum bs for dd? Michael Stone <mstone@debian.org> - 2021-05-16 19:50 +0200
      Re: OT: minimum bs for dd? Richard Owlett <rowlett@cloud85.net> - 2021-05-16 20:40 +0200
        Re: OT: minimum bs for dd? Stefan Monnier <monnier@iro.umontreal.ca> - 2021-05-17 00:40 +0200
          Re: OT: minimum bs for dd? The Wanderer <wanderer@fastmail.fm> - 2021-05-17 00:50 +0200
            Re: OT: minimum bs for dd? "Thomas Schmitt" <scdbackup@gmx.net> - 2021-05-17 09:00 +0200
              Re: OT: minimum bs for dd? The Wanderer <wanderer@fastmail.fm> - 2021-05-17 12:30 +0200
            Re: OT: minimum bs for dd? Greg Wooledge <greg@wooledge.org> - 2021-05-17 13:20 +0200
          Re: OT: minimum bs for dd? Andrei POPESCU <andreimpopescu@gmail.com> - 2021-05-17 08:10 +0200
            Re: OT: minimum bs for dd? <tomas@tuxteam.de> - 2021-05-17 08:40 +0200
              Re: OT: minimum bs for dd? Andrei POPESCU <andreimpopescu@gmail.com> - 2021-05-17 09:30 +0200
                Re: OT: minimum bs for dd? David <bouncingcats@gmail.com> - 2021-05-17 10:00 +0200
                Re: OT: minimum bs for dd? Andrei POPESCU <andreimpopescu@gmail.com> - 2021-05-17 14:10 +0200
                Re: OT: minimum bs for dd? <tomas@tuxteam.de> - 2021-05-17 10:10 +0200
                Re: OT: minimum bs for dd? Andrei POPESCU <andreimpopescu@gmail.com> - 2021-05-17 14:30 +0200
                Re: OT: minimum bs for dd? <tomas@tuxteam.de> - 2021-05-17 15:00 +0200
                info pages WHERE? -- was [Re: OT: minimum bs for dd?] Richard Owlett <rowlett@cloud85.net> - 2021-05-17 15:00 +0200
                Re: info pages WHERE? -- was [Re: OT: minimum bs for dd?] <tomas@tuxteam.de> - 2021-05-17 15:10 +0200
                Re: info pages WHERE? -- was [Re: OT: minimum bs for dd?] Richard Owlett <rowlett@cloud85.net> - 2021-05-17 15:20 +0200
                Re: info pages WHERE? -- was [Re: OT: minimum bs for dd?] IL Ka <kazakevichilya@gmail.com> - 2021-05-17 15:30 +0200
                Re: info pages WHERE? -- was [Re: OT: minimum bs for dd?] Richard Owlett <rowlett@cloud85.net> - 2021-05-17 16:00 +0200
                Re: info pages WHERE? -- was [Re: OT: minimum bs for dd?] Greg Wooledge <greg@wooledge.org> - 2021-05-17 15:40 +0200
                Re: info pages WHERE? -- was [Re: OT: minimum bs for dd?] "Thomas Schmitt" <scdbackup@gmx.net> - 2021-05-17 16:10 +0200
                Re: info pages WHERE? -- was [Re: OT: minimum bs for dd?] Greg Wooledge <greg@wooledge.org> - 2021-05-17 17:10 +0200
                Re: info pages WHERE? -- was [Re: OT: minimum bs for dd?] "Thomas Schmitt" <scdbackup@gmx.net> - 2021-05-17 18:00 +0200
                Re: info pages WHERE? -- was [Re: OT: minimum bs for dd?] Brian <ad44@cityscape.co.uk> - 2021-05-17 20:30 +0200
                Re: info pages WHERE? -- was [Re: OT: minimum bs for dd?] Greg Wooledge <greg@wooledge.org> - 2021-05-17 20:50 +0200
                Re: info pages WHERE? -- was [Re: OT: minimum bs for dd?] Brian <ad44@cityscape.co.uk> - 2021-05-17 21:00 +0200
                Re: info pages WHERE? -- was [Re: OT: minimum bs for dd?] <tomas@tuxteam.de> - 2021-05-17 16:10 +0200
            Re: OT: minimum bs for dd? Brian <ad44@cityscape.co.uk> - 2021-05-17 16:20 +0200
          Re: OT: minimum bs for dd? <tomas@tuxteam.de> - 2021-05-17 08:40 +0200
            Re: OT: minimum bs for dd? Richard Hector <richard@walnut.gen.nz> - 2021-05-17 13:40 +0200
        Re: OT: minimum bs for dd? Michael Stone <mstone@debian.org> - 2021-05-16 20:50 +0200
          Re: OT: minimum bs for dd? "Andrew M.A. Cater" <amacater@einval.com> - 2021-05-16 23:40 +0200

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