Redirect STDIN in bash?

Question

For an example i would like to login to mysql with a password. i KNOW i can use -pmypass but i want to learn how do i redirect stdin in bash. So my test is

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Answer 1

command <<< "input"

That's a bashism and echo solution is more common in scripts, though my solution can be more handy in an interactive shell (and I doubt any of these solutions works with mysql, but your question is more general).

Answer 2

Normally, it's just:

echo password|command

But many programs, including MySQL, that read passwords don't actually read from stdin. Rather, they interact with the terminal directly. See Trick an application into thinking its stdin is interactive, not a pipe.