File: file_to_bytes.rb

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file content (5 lines) | stat: -rwxr-xr-x 140 bytes parent folder | download | duplicates (5) 
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#!/usr/bin/env ruby

lst = (ARGV.empty? ? STDIN.read : IO.binread(ARGV[0])).bytes.map {|_| '0x%02X' % _ }
puts lst.size
puts lst.join(', ')