在bash中重定向STDIN？

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

mysql -u limited_user -p <text to redirect into stdin when it prompts for my pass>

I seen < filename before but i dont want to store the data in a file. I tried & and &- but had no luck. I am not sure what &- does.

Answer 1

command <<< "input"

这是一个基础和echo解决方案在脚本中更常见，虽然我的解决方案在交互式shell中更方便（我怀疑这些解决方案中的任何一个都适用于mysql，但你的问题更为通用）。

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 .