Display wget downloaded content on standard output.

$ wget --quiet --output-document - gentoo.org/robots.txt
User-agent: AhrefsBot
Disallow: /

User-agent: *
Allow: /

Excerpt from the manual page.


-O file
   The documents will not be written to the appropriate files, but all will be concatenated together and written to file.  If - is used as file,
   documents will be printed to standard output, disabling link conversion.  (Use ./- to print to a file literally named -.)

   Use of -O is not intended to mean simply "use the name file instead of the one in the URL;" rather, it is analogous to shell redirection: wget -O
   file http://foo is intended to work like wget -O - http://foo > file; file will be truncated immediately, and all downloaded content will be
   written there.

   For this reason, -N (for timestamp-checking) is not supported in combination with -O: since file is always newly created, it will always have a
   very new timestamp. A warning will be issued if this combination is used.

   Similarly, using -r or -p with -O may not work as you expect: Wget won't just download the first file to file and then download the rest to their
   normal names: all downloaded content will be placed in file. This was disabled in version 1.11, but has been reinstated (with a warning) in
   1.11.2, as there are some cases where this behavior can actually have some use.

   A combination with -nc is only accepted if the given output file does not exist.

   Note that a combination with -k is only permitted when downloading a single document, as in that case it will just convert all relative URIs to
   external ones; -k makes no sense for multiple URIs when they're all being downloaded to a single file; -k can be used only when the output is a
   regular file.


Simple as that.