How to access an environment variable with .(dot) in the name

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Hello, can anyone tell me how to access an environment variable with .(dot) in the name using linux terminal

linux variables

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Apparently this is not possible (in BASH). Only alphanumeric characters and underscores are allowed.

export [-fn] [name[=word]] ...

name   A  word  consisting  only  of alphanumeric characters and under‐
      scores, and beginning with an alphabetic character or an  under‐
      score.  Also referred to as an identifier.

Source in English: https://unix.stackexchange.com/questions/93532/exporting-a-variable-with-dot-in-it

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