Bash and Ruby solutions for week 97, part 2

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diff --git a/challenge-097/abigail/ruby/ch-2.rb b/challenge-097/abigail/ruby/ch-2.rb
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+#!/usr/bin/ruby
+
+#
+# See ../README.md
+#
+ 
+#
+# Run as: ruby ch-2.rb -s SECTIONS < input-file
+#
+
+require 'optparse'
+
+NR_OF_LETTERS = 26
+
+
+#
+# Parse and validate options
+#
+params   = ARGV . getopts ('s:')
+sections = params ["s"] ? params ["s"] . to_i : -1
+
+if sections < 0
+    STDERR . puts "Requires a -s SECTIONS option"
+    exit 1
+end
+
+
+#
+# Iterate over the input. For each position, count the number of 0s,
+# and calculate the number of 1s. Sum the minimum of those numbers.
+#
+ARGF . each_line do |line|
+     s_len = (line . length - 1) / sections
+     sum = 0
+     for i in 0 .. s_len - 1 do
+         zeros = 0
+         for j in 0 .. sections - 1 do
+             index = j * s_len + i
+             if   line [index, 1] == "0"
+             then zeros += 1
+             end
+         end
+         ones = sections - zeros
+         sum += [zeros, ones] . min
+     end
+     puts sum
+end