doc: Explain how to select system package outputs.
* doc/guix.texi (operating-system Reference): Document that PACKAGES may contain traces of tuples and give an example.master
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@ -11962,8 +11962,15 @@ A string denoting the contents of the @file{/etc/issue} file, which is
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displayed when users log in on a text console.
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@item @code{packages} (default: @code{%base-packages})
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The set of packages installed in the global profile, which is accessible
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at @file{/run/current-system/profile}.
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A list of packages to be installed in the global profile, which is accessible
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at @file{/run/current-system/profile}. Each element is either a package
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variable or a package/output tuple. Here's a simple example of both:
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@lisp
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(cons* git ; only the default "out" output
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(git "send-email") ; another output of the git package
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%base-packages) ; the default set
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@end lisp
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The default set includes core utilities and it is good practice to
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install non-core utilities in user profiles (@pxref{Invoking guix
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