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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 1 May 2018
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      Hector Martin Retweeted GangBen

      I use pv(1) all the time. Not a standard command, but everyone should install it and start using it. It replaces dd for most use cases and Just Does The Right Thing by default. It's part of my required packages list on every system, along with strace, htop, iotop, and vim.https://twitter.com/Yeah1Whatever/status/991568978479910913 …

      Hector Martin added,

      GangBen @Yeah1Whatever
      Replying to @marcan42
      `pv` is great, when you want to have a progress bar / speed indicator in a piped data stream. Just use it instead of cat or put it somewhere between your chain
      5 replies 10 retweets 46 likes
    2. Cybergibbons‏ @cybergibbons 2 May 2018
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      Replying to @marcan42

      Replaces dd?

      1 reply 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 2 May 2018
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      Replying to @cybergibbons

      dd is useless most of the time. You can just pipe to/from block devices normally, e.g. with cat. pv is smart enough to query stdin *or* stdout device size and use it to show the progress bar and determine ETA. zcat file.img.gz | pv > /dev/sdc will use size of /dev/sdc.

      3 replies 0 retweets 3 likes
    4. hedge.txt | Mostly Inactive, except when not‏ @hedgeberg 2 May 2018
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      Replying to @marcan42 @cybergibbons

      WHY THE FUCK HAVE I BEEN DOING THIS FOR SO LONG: dd if=/dev/bullshit1 | pv | dd of=/dev/bullshit2 I SAW THAT RECOMMENDED SO MANY PLACES. PV TOTALLY REPLACES DD? WHY IN THE HELL WOULD SOMEONE RECOMMEND THIS

      2 replies 0 retweets 8 likes
    5. Hector Martin‏ @marcan42 2 May 2018
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      Replying to @hedgeberg @cybergibbons

      You can just use cat (or nothing if just redirecting around another command). dd is total and utter cargo cult unless you need the seek/skip options. And even for that it's crap, because there's no reason for seek/skip to be in units of the transfer blocksize. And it's slow.

      3 replies 0 retweets 3 likes
    6. Lukas Schauer‏ @lukas2511 2 May 2018
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      Replying to @marcan42

      I'm using dd because it allows me to set sync options so I get real throughput info instead of how fast my cache in memory is. Can this easily be done directly with pv as well?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 2 May 2018
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      Replying to @lukas2511

      No, but direct I/O is a bad idea anyway, because it isn't actually how filesystems are used in practice. If you want to do a cache-cold test then just drop caches with echo 3 > /proc/sys/vm/drop_caches.

      11:04 AM - 2 May 2018
      2 replies 0 retweets 0 likes
        1. Schorsch‏ @schorsch3000 2 May 2018
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          Replying to @marcan42 @lukas2511

          pv -pertb < fancyOS.img >/dev/sdX dosn't work on a filesystem. The output it reports while getting any os-image onto an usb-flash-drive is a blazing fast operation and freezes for a few minutes afterwards. But i like pv for operations that have at least one endpoint in software

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        1. Lukas Schauer‏ @lukas2511 2 May 2018
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          Replying to @marcan42

          I'm using that when writing to block devices, there it should be okay and I like to have a real estimated time instead of having pv "finish" in a second with a few minutes of syncing afterwards :-/

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