I have been trying to figure out how, while using OptionParser to be able to check for files being input on the command line and if they don’t exist, check other input streams (like Bash). This initially wasn’t very easy since input streams are blocking. So with a little help from friends (thanks roberto), I was able to use his method of non-blocking IO and wrap it in a begin/rescue block. I also took a little advice given in this Stack Overflow question called Best Practices with STDIN in Ruby.
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