Unix mail utility - 'You must specify direct recipients with -s, -c, or -b'

Wikipedia says that this should work:

echo "Some message" | mail -s "meeting today" somebody@example.com 

But I do not get any mails, instead an error message:

$ echo "world" | mail -s "hello, " -c lazer@gmail.com
You must specify direct recipients with -s, -c, or -b.
$

What is the 开发者_JS百科correct way to use mail?

You are trying to send mail without specifying the To:, just who you are CC-ing it to.

Do something like:

echo "world" | mail -s "hello, " me@myself.com -c lazer@gmail.com

To send it to yourself, but CC it to the person you wanted to CC it to (or just send it to them without the -c flag)