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[root@amd-nixos:~]# ls -lh /root/.nix-defexpr/channels /home/clever/.nix-defexpr/channels*
lrwxrwxrwx 1 clever users 46 Mar  7 02:58 /home/clever/.nix-defexpr/channels -> /nix/var/nix/profiles/per-user/clever/channels
lrwxrwxrwx 1 clever users 44 Oct 11  2015 /home/clever/.nix-defexpr/channels_root -> /nix/var/nix/profiles/per-user/root/channels
lrwxrwxrwx 1 root   root  44 Apr 11 03:40 /root/.nix-defexpr/channels -> /nix/var/nix/profiles/per-user/root/channels

[nix-shell:~/not-os]$ ls -lh /nix/var/nix/profiles/{system{,-226-link},default{,-50-link},per-user/{root/channels{,-26-link},clever/{profile{,-260-link},channels{,-5-link}}}}
lrwxrwxrwx 1 root   root  15 Apr 24 13:38 /nix/var/nix/profiles/default -> default-50-link
lrwxrwxrwx 1 root   root  60 Apr 24 13:38 /nix/var/nix/profiles/default-50-link -> /nix/store/za5w3l0g95gxqx5gs8xvfml2fj2as4r9-user-environment
lrwxrwxrwx 1 clever users 15 Mar  7 03:14 /nix/var/nix/profiles/per-user/clever/channels -> channels-5-link
lrwxrwxrwx 1 clever users 60 Mar  7 02:58 /nix/var/nix/profiles/per-user/clever/channels-5-link -> /nix/store/9d5snnrrf15h878y0b2kq0pbsblfckxy-user-environment
lrwxrwxrwx 1 clever users 16 May  3 06:20 /nix/var/nix/profiles/per-user/clever/profile -> profile-260-link
lrwxrwxrwx 1 clever users 60 May  3 06:20 /nix/var/nix/profiles/per-user/clever/profile-260-link -> /nix/store/jcv8ahaw96g86vpadfmhgnlkz3cz8rdi-user-environment
lrwxrwxrwx 1 root   root  16 Apr 11 03:40 /nix/var/nix/profiles/per-user/root/channels -> channels-26-link
lrwxrwxrwx 1 root   root  60 Apr  2 19:30 /nix/var/nix/profiles/per-user/root/channels-26-link -> /nix/store/dkbmg1saqm9wxy4r3479dmp2z8ivchig-user-environment
lrwxrwxrwx 1 root   root  15 Jun  6 21:29 /nix/var/nix/profiles/system -> system-226-link
lrwxrwxrwx 1 root   root  85 Jun  6 21:29 /nix/var/nix/profiles/system-226-link -> /nix/store/f88wn92yqw886m829g080v3d3s5abqf8-nixos-system-amd-nixos-16.09.git.0bf8a1aM