From: Brian Candler <b.candler@...>
Date: 2011-04-08T22:32:48+09:00
Subject: Re: reading and writing to child process with streams in ruby

mpurdy wrote in post #991644:
> echo -n "username: "

You are sending just "username: " without a trailing newline.

>          line = stdout.read

Here you are reading from stdout until the end-of-file (i.e. until the 
other side terminates or closes the file). This will wait forever.

Two possible solutions:

1. Change your shell script to send data ending with a newline, then use 
'gets' in the ruby code.

2. More generally, use expect.rb in the standard library. Then you can 
wait for a particular sequence of characters, e.g. /name: /, before 
continuing.

HTH,

Brian.

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