Mercurial > repo

view wisdom/block device @ 10148:3dcbcbb63eb0

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
<oerjan> learn `spam <n> prints the nth output piece of the previous 1, 2 or sport command. n defaults to the next piece to display. Abbreviation: `n.
author HackBot
date Thu, 19 Jan 2017 02:59:35 +0000
parents 272663b31668
children
line wrap: on
line source

Block devices are a concession made in Unix to make raw hard disks and magnetic tape have a similar interface to regular files and terminals. Since magnetic tapes can't write individual bytes, only entire blocks, the interface isn't exactly the same, thus the dreaded dd obs= option was born.