$ who is god
slt pts/0 2021-06-10 00:23 (192.168.0.2)
$ who 1 2
slt pts/0 2021-06-10 00:23 (192.168.0.2)
$ who --help
...
Usage: who [OPTION]... [ FILE | ARG1 ARG2 ]
If ARG1 ARG2 given, -m presumed: 'am i' or 'mom likes' are usual.
And this is like this since at least BSD.