Talk:dd (Unix)

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Dcfldd was nominated for deletion. The discussion was closed on 17 April 2013 with a consensus to merge. Its contents were merged into Dd (Unix). The original page is now a redirect to this page. For the contribution history and old versions of the redirected article, please see its history; for its talk page, see here.

Learn The DD Command External Reference

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improve text / examples

I just /dev/zero'ed some harddisks and i found out, that the blocksize has a great performance impact

With defautl bs: 15MB/s

With bs=100M: 65MB/s

Maybe also mention that sending SIGUSR1 to gnu dd will make it print progress and writing speed.

Example code:

while sleep 1s; do killall dd -USR1 2> /dev/null; done &

dd if=/dev/zero of=/dev/hdb bs=100M

Misleading title

As dd is available on more environments than Unix, the title "dd (Unix)" is inaccurate and misleading. But, what to use? There is some precedent for (command) as in file (command), but command is pretty generic. How about dd (shell command). Stevebroshar (talk) 15:53, 26 March 2025 (UTC)[reply]

X/Open Portability Guide

WRT "In 1987, the dd command is specified in the X/Open Portability Guide issue 2 of 1987. This is inherited by IEEE Std 1003.1-2008 (POSIX), which is part of the Single UNIX Specification."

What does "this" refer to? the X/Open Portability Guide issue 2? Was that guide inherited into POSIX.1-2008? I find no evidence of that. Need a citation or to remove this claim.

Also, as this is history and the info is mostly chronological, it seems odd that a section about 1987 refers to something from 2008. Stevebroshar (talk) 14:33, 20 April 2025 (UTC)[reply]