How to echo to stdout?

Hi,

The following command does not echo anything to stdout.

~/linux/bin/xplat/src/vim/vimS/main$ cat main.vimrc
:echo "Hello world"
:q
~/linux/bin/xplat/src/vim/vimS/main$ vim -S main.vimrc

Is there a way to echo the message to stdout? Also what is the fd
number that echo print to by default and how it implement in vim?
Thanks.

Regard,
Peng

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