Hi,

On p. 131-132 in "Programming Ruby 2d.", it talks about writing binary
data to files, but there's no explanation of the syntax:

str1 = "\001\002\003"

I looked in the index of the book, I poured over "The Ruby Language"
chapter, and I also couldn't find any escape character that was "\0".
Is that Ruby's unicode syntax?   How about a ding dang explanation Mr.
Thomas?
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