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(texinfo)env

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`@env'{ENVIRONMENT-VARIABLE}
----------------------------

  Use the `@env' command to indicate environment variables, as used by
many operating systems, including GNU.  Do not use it for metasyntactic
variables; use `@var' instead (see the previous section).

  `@env' is equivalent to `@code' in its effects.  For example:

     The @env{PATH} environment variable ...
   produces
     The `PATH' environment variable ...