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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 sets the search path for commands.

produces

The @env{PATH} environment variable sets the search path for commands.

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