rusers(1) on Linux
The text a9dc4f46a6f4, as Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo), Debian 1.2 (Rex) shipped it.
who is logged in to machines on local network
Flags it lists
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-a -
-l