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#!/usr/bin/env ruby
TO = ARGV.shift.chomp.downcase
MAC = ARGV.shift.chomp.gsub(/[.:]/, '')
UPPER = ARGV.shift ? true : false
if MAC.match(/[0-9a-fA-F]{12}/).nil? then
puts "Not a valid MAC"
exit 1
end
case TO
when 'cisco'
puts (UPPER ? MAC.upcase : MAC).scan(/[A-Fa-f0-9]{4}/).join('.')
when 'canonical'
puts (UPPER ? MAC.upcase : MAC).scan(/[A-Fa-f0-9]{2}/).join(':')
end
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