Conventions Used in This Book

We use the following font and format conventions for Unix commands, utilities, and system calls:

• Excerpts from scripts or configuration files are shown in a constant-width font:

  if test -x /usr/sbin/named -a -f /etc/named.con
  then
       /usr/sbin/named
  fi

• Sample interactive sessions, showing command-line input and corresponding output, are shown in a constant-width font, with user-supplied input in bold:

  %  cat /var/run/named.pid
  78

• If the command must be typed by the superuser (root), we use the sharp or pound sign (#):

  # /usr/sbin/named

• Replaceable items in code are printed in constant-width italics.

• Domain names, filenames, functions, commands, Unix manpages, and programming elements taken from the code snippets are printed in italics when they appear within a paragraph.