難読化shell芸を手助けするscript

obfsh.rb

obfresult= ["__=$(. 2>&1);","___=$(/ 2>&1);","__=${__##*.};",'___=$(${__:4:1}c$(printf "\x68")o $___|cut -d":" -${__:1:1}2-);']
obfchain={
    "a" => '${__:6:1}',
    "b" => '$(printf "%b\n" $(printf "%s%x" "\x" 98))',
    "c" => '${___:13:1}',
    "d" => '${___:9:1}',
    "e" => '${__:4:1}',
    "f" => '${__:1:1}',
    "g" => '${__:13:1}',
    "h" => '$(printf "\x68")',
    "i" => '${___:10:1}',
    "j" => '$(printf "\x6a")',
    "k" => '$print "\x6b")',
    "l" => '${__:3:1}',
    "m" => '${__:7:1}',
    "n" => '${__:5:1}',
    "o" => '${___:15:1}',
    "p" => '$(printf "\x70")',
    "q" => '$(printf "\x71")',
    "r" => '${___:11:1}',
    "s" => '${___:5:1}',
    "t" => '${__:18:1}',
    "u" => '$(printf "\x75")',
    "v" => '$(printf "\x76")',
    "w" => '$(printf "\x77")',
    "x" => '$(printf "\x78")',
    "y" => '${___:17:1}',
    "z" => '$(printf "\x7a")',
    ">" => ">",
    "<" => "<",
    " " => " $(:;:;:;:;:;:;)",
    "-" => "-",
    "." => ".",
    "[" => "${__:10:1}",
    "]" => "${__:20:1}",
    "{" => "{",
    "}" => "}",
    "$" => "$",
    "&" => "&",
    "#" => "#",
    "(" => "(",
    ")" => ")",
    "|" => "|",
    "\"" => "\"",
    "/"=>"${___:1:1}",
    "'" => "'",
    ";" => ';',
    "9" => "$(((((1+1)*2)+1)*2-1))",
    "8" => "$(((1+1+1)*2+1+1))",
    "7" => "$(((1+1+1+1+1)+1+1))",
    "6" => "$(((2*2)+2))",
    "5" => "$((((1*1*1*1*1)+1*2)+1))",
    "4" => "$((2*2))",
    "3" => "$((1+1+1))",
    "2" => "2",
    "1" => "1"
}


if ARGV.length > 0
    ARGV[0].each_char do |i|
        obfresult.push(obfchain[i])
    end
    puts obfresult.join
else
    puts "obfsh.rb <shellsctipt>"
end