psutil

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#!/usr/bin/env python3
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# Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""A clone of 'who' command; print information about users who are
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currently logged in.
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$ python3 scripts/who.py
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giampaolo    console    2017-03-25 22:24                loginwindow
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giampaolo    ttys000    2017-03-25 23:28 (10.0.2.2)     sshd
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"""
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from datetime import datetime
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import psutil
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def main():
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    users = psutil.users()
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    for user in users:
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        proc_name = psutil.Process(user.pid).name() if user.pid else ""
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        line = "%-12s %-10s %-10s %-14s %s" % (
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            user.name,
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            user.terminal or '-',
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            datetime.fromtimestamp(user.started).strftime("%Y-%m-%d %H:%M"),
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            "(%s)" % user.host if user.host else "",
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            proc_name,
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        )
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        print(line)
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if __name__ == '__main__':
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    main()
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