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optimization: do not repeatedly use dup()

From: Ralf Wildenhues
Subject: optimization: do not repeatedly use dup()
Date: Thu, 12 May 2005 13:58:30 +0200
User-agent: Mutt/1.4.1i

Why does the shell snippet
  exec 5>file
  echo foo >&5
  echo bar >&5

cause repeated dup()ing and close()ing of the file descriptor instead of
a simple write() to the already open file descriptor, as pointed out in

Looks like a simple optimization to avoid 2 of 3 syscalls (disclaimer: I
have not looked at the bash source code at all).


[1] http://lists.gnu.org/archive/html/bug-libtool/2005-05/msg00150.html

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