$ systemctl --user status
● amd-nixos
    State: running
     Jobs: 0 queued
   Failed: 0 units
    Since: Sat 2017-03-25 11:56:11 ADT; 4 weeks 0 days ago
   CGroup: /user.slice/user-1000.slice/[email protected]
           └─init.scope
             ├─18191 /nix/store/4mhj2swvnacffi9zyj54gd5ig343jwga-systemd-232/lib/systemd/systemd --user
             └─18192 (sd-pam