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Comment by dpflug | Hacker News Reader

Faster still is

  pv < /dev/zero > /dev/null

Yes but you don't have control of which character is written (only NULLs).

yes lets you specify which character to output. 'yes n' for example to output n.

Yes doesn't just let you choose a character. It lets you choose a string that will be repeated. So

    yes 123abc

will print

    123abc123abc123abc123abc123abc

and so on.

each time terminated by a newline, so:

  123abc
  123abc
  123abc
  ...