As we know, commands below can add new path in the tail of original
ENV['path'](i.e. /path_old:/path_new)

ENV['PATH'] += ":/path_new"

If I want the new path added in the head of original ENV['path'](i.e.
/path_new:/path_old), is there quick way simlilar as "+="?

Certainly commands below works, just want to know whether simplified
command similiar with "+=".

ENV['PATH'] = '/path_new' + ':' + '/path_old'

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