This is most certainly because you are using your shell's built-in
'echo':
[cerdea-aws]cerdea@icatu:~$ echo --version
--version
[cerdea-aws]cerdea@icatu:~$ env echo --version
echo (GNU coreutils) 8.23
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by Brian Fox and Chet Ramey.
[cerdea-aws]cerdea@icatu:~$
Closing as Not-A-Bug.
** Changed in: coreutils (Ubuntu)
Status: New => Invalid
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Touch seeded packages, which is subscribed to coreutils in Ubuntu.
https://bugs.launchpad.net/bugs/1520258
Title:
echo's man-page claims switches "--help" & "--version" work, but
instead are just echoed
Status in coreutils package in Ubuntu:
Invalid
Bug description:
Ubuntu 15.10, using coreutils version 8.23-4ubuntu2. Typing "echo
--help" or "echo --version" into the terminal echoes "--help" and "--
version", respectively.
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https://bugs.launchpad.net/ubuntu/+source/coreutils/+bug/1520258/+subscriptions
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