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The previous patch broke -nG, so move the -G code back to showone()
which handles -n.
Add the missing tests for the various uses of -n.
Also refactor the code to avoid the need to test optflags directly.
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Handle unknown groups (fixes #117).
Fix -G to show *all* groups, not just all supplementary groups.
Fix -Z output to not include "context=".
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Fall back to converting the "name" to an integer and calling getpwuid().
We need to update `username` for the later call to getgrouplist().
Also fix the separator printing logic to avoid a trailing ',' on `id 0`.
Switch to FLAG() and move some declarations down to where they can be
initialized, both for clarity.
Also add simple tests. Sadly, there's no always-present user that is in
multiple groups.
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