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Yes, exactly, if that code is operating inside a loop like that, it will read from the file and not from the terminal. </dev/tty will always read from the terminal -- if you have a terminal, that is.

I tested this snipplet on busybox 1.19.4 and it works as expected.

So as Corona688 requests, I also must ask how the trap is being called. If there are redirections affecting stdin, maybe read is...

1) Surely "Echo" should be lower case "echo" ?

2) No idea about the "let" because none of the code posted contains "let".