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 Often-Used Commands
 ===================
 
    If you use `sed' at all, you will quite likely want to know these
 commands.
 
 `#'
      [No addresses allowed.]
 
      The `#' character begins a comment; the comment continues until
      the next newline.
 
      If you are concerned about portability, be aware that some
      implementations of `sed' (which are not POSIX conformant) may only
      support a single one-line comment, and then only when the very
      first character of the script is a `#'.
 
      Warning: if the first two characters of the `sed' script are `#n',
      then the `-n' (no-autoprint) option is forced.  If you want to put
      a comment in the first line of your script and that comment begins
      with the letter `n' and you do not want this behavior, then be
      sure to either use a capital `N', or place at least one space
      before the `n'.
 
 `q [EXIT-CODE]'
      This command only accepts a single address.
 
      Exit `sed' without processing any more commands or input.  Note
      that the current pattern space is printed if auto-print is not
      disabled with the `-n' options.  The ability to return an exit
      code from the `sed' script is a GNU `sed' extension.
 
 `d'
      Delete the pattern space; immediately start next cycle.
 
 `p'
      Print out the pattern space (to the standard output).  This
      command is usually only used in conjunction with the `-n'
      command-line option.
 
 `n'
      If auto-print is not disabled, print the pattern space, then,
      regardless, replace the pattern space with the next line of input.
      If there is no more input then `sed' exits without processing any
      more commands.
 
 `{ COMMANDS }'
      A group of commands may be enclosed between `{' and `}' characters.
      This is particularly useful when you want a group of commands to
      be triggered by a single address (or address-range) match.
 
 

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