(Bash) Piping echo into node disables program keyboard input

Question

So I am using node.js' built-in debugger and trying to skip the "break on first line" that it performs by passing in a delayed "c" keypress (c=continue) using echo, as such:

(sleep 1; echo -ne 'c\n') | node debug ~/src/main.js

It works as expected, but the node debugger no longer seems to accept keyboard input afterwords. I assume the piping in bash is doing something to cause node to ignore the keyboard. Anyone know how I can achieve the same result but maintain keyboard input to the node program?

Perhaps this will be helpful: stackoverflow.com/questions/16420374/… — Jordan Running
– Jordan Running, Commented Oct 20, 2014 at 22:32

tripleee · Accepted Answer · 2014-10-21 10:21:32Z

1

Because node is being run in a pipeline, its input file descriptor is open to the pipeline, not to the console.

A common way to feed input to a process and then allow the user to interact is to use expect or pexpect.

answered Oct 21, 2014 at 10:21

tripleee

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