singleton method ENV.except

引数で指定された以外のキーとその値だけを含む Hash を返します。

p ENV                     # => {"LANG" => "en_US.UTF-8", "TERM" => "xterm-256color", "HOME" => "/Users/rhc"}
p ENV.except("TERM","HOME") # => {"LANG" => "en_US.UTF-8"}

[SEE_ALSO] Hash#except, ENV.slice