How can I pipe initial input into process which will then be interactive?

Question

I\'d like to be able to inject an initial command into the launching of an interactive process, so that I can do something like this:

echo \"initial command\         


        

Answer 1

You don't need to write a new tool to forward stdin - one has already been written (cat):

(echo "initial command" && cat) | some_tool

This does have the downside of connecting a pipe to some_tool, not a terminal.