texinfo: @env

Indicating

@file

@var

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9.1.8 '@env'{ENVIRONMENT-VARIABLE}
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Use the '@env' command to indicate environment variables, as used by
many operating systems, including GNU.  Do not use it for
_meta_syntactic variables; use '@var' for those (see the previous
section).

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

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