gistfile1.txt

[root@rpi:~]# ls -la /nix/var/nix/profiles
total 40
drwxr-xr-x 3 root root 4096 Nov 21 13:30 .
drwxr-xr-x 8 root root 4096 Jan  1  1970 ..
drwxrwxrwt 3 root root 4096 Jan  1  1970 per-user
lrwxrwxrwx 1 root root   13 Nov 21 13:30 system -> system-7-link
lrwxrwxrwx 1 root root   84 Jan  1  1970 system-1-link -> /nix/store/s8zghld9hj07vh4w2dvgi9v3q8p6h7ka-nixos-system-nixos-19.03.git.ca2ba44cab4
lrwxrwxrwx 1 root root   83 Nov 20 16:25 system-2-link -> /nix/store/r4w57ribbvd8m2581n7q4fx1j2q1np3n-nixos-system-rpi-18.09.1228.a4c4cbb613c
lrwxrwxrwx 1 root root   83 Nov 20 16:52 system-3-link -> /nix/store/qaz34a8y1r5kxxcasjy8cjzb0d3wk816-nixos-system-rpi-18.09.1228.a4c4cbb613c
lrwxrwxrwx 1 root root   83 Nov 20 20:12 system-4-link -> /nix/store/9grmky855fcvjrq0qigc32hpk9g2i67z-nixos-system-rpi-18.09.1228.a4c4cbb613c
lrwxrwxrwx 1 root root   83 Nov 21 01:06 system-5-link -> /nix/store/xkshrk4yn2xqcch8iim2jd2lkswymyb9-nixos-system-rpi-18.09.1228.a4c4cbb613c
lrwxrwxrwx 1 root root   83 Nov 21 12:23 system-6-link -> /nix/store/wgv4skizwmbvvl6jqbrjqggbpj67n8xz-nixos-system-rpi-18.09.1228.a4c4cbb613c
lrwxrwxrwx 1 root root   83 Nov 21 12:30 system-7-link -> /nix/store/ab8y82zkd8y4hp7z3v18lqm9yj1zww7q-nixos-system-rpi-18.09.1228.a4c4cbb613c

[root@rpi:~]# ls -la /run/*-system
lrwxrwxrwx 1 root root 83 Jan  1  1970 /run/booted-system -> /nix/store/r4w57ribbvd8m2581n7q4fx1j2q1np3n-nixos-system-rpi-18.09.1228.a4c4cbb613c
lrwxrwxrwx 1 root root 83 Jan  1  1970 /run/current-system -> /nix/store/r4w57ribbvd8m2581n7q4fx1j2q1np3n-nixos-system-rpi-18.09.1228.a4c4cbb613c