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The following options are available:

     -E      Interpret regular expressions as extended (modern) regular
             expressions rather than basic regular expressions (BRE's).  The
             re_format(7) manual page fully describes both formats.

     -a      The files listed as parameters for the ''w'' functions are cre-
             ated (or truncated) before any processing begins, by default.
             The -a option causes sed to delay opening each file until a com-
             mand containing the related ''w'' function is applied to a line
             of input.

     -e command
             Append the editing commands specified by the command argument to
             the list of commands.

     -f command_file
             Append the editing commands found in the file command_file to the
             list of commands.  The editing commands should each be listed on
             a separate line.

     -i extension
             Edit files in-place, saving backups with the specified extension.
             If a zero-length extension is given, no backup will be saved.  It
             is not recommended to give a zero-length extension when in-place
             editing files, as you risk corruption or partial content in situ-
             ations where disk space is exhausted, etc.

     -l      Make output line buffered.

     -n      By default, each line of input is echoed to the standard output
             after all of the commands have been applied to it.  The -n option
             suppresses this behavior.