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Environment variables can be queried, not only in batch mode but also in interactive mode. This can be an alternative way to pass information to a macro.
From a command line, inspect the current environment variables with env | sort and choose one, for example HOST, which provides the name of the machine you are working on. In a macro, get the value of this variable a chosen environment variable (e.g. HOST) using the getenv() function. For example:
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