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From: Jilles Tjoelker <jilles@FreeBSD.org>
Date: Sun, 20 Mar 2011 23:52:45 +0000 (UTC)
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Subject: cvs commit: src/bin/sh sh.1
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jilles      2011-03-20 23:52:45 UTC

  FreeBSD src repository

  Modified files:
    bin/sh               sh.1 
  Log:
  SVN rev 219806 on 2011-03-20 23:52:45Z by jilles
  
  sh(1): Describe subshell environment, command substitution more correctly.
  
  POSIX does not require the shell to fork for a subshell environment, and we
  use that possibility in various ways (command substitutions with a single
  command and most subshells that are the final command of a shell process).
  Therefore do not tie subshells to forking in the man page.
  
  Command substitutions with expansions are a bit strange, causing a fork for
  $(...$(($x))...) because $x might expand to y=2; they will probably be
  changed later but this is how they work now.
  
  Revision  Changes    Path
  1.160     +19 -7     src/bin/sh/sh.1