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I use NixOS:

$ nixos-version 16.03pre71289.7ae05ed (Emu) $ nix-env --version nix-env (Nix) 1.10 $ nix-channel --list $ sudo nix-channel --list nixos https://nixos.org/channels/nixos-unstable 

Installing something through nix-env outputs information, like:

$ nix-env -i rogue installing ‘rogue-5.4.4’ these paths will be fetched (0.09 MiB download, 0.28 MiB unpacked): /nix/store/rvkjrq24fy510m9dwd12lhry1zkx57iy-rogue-5.4.4 fetching path ‘/nix/store/rvkjrq24fy510m9dwd12lhry1zkx57iy-rogue-5.4.4’... *** Downloading ‘https://cache.nixos.org/nar/0jpxvn40r27zz9pz54kvfrsy2lwafysbpr6pkhkafizzxqgb2a0c.nar.xz’ (signed by ‘cache.nixos.org-1’) to ‘/nix/store/rvkjrq24fy510m9dwd12lhry1zkx57iy-rogue-5.4.4’... % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 95184 100 95184 0 0 104k 0 --:--:-- --:--:-- --:--:-- 104k building path(s) ‘/nix/store/y8z7yi655sslnmx4b7zb1vaqp49ac8i6-user-environment’ created 839 symlinks in user environment 

Reading Nix manual suggested nix-store command, but I'm not sure how to use it.

How do I view logs of what I ever installed through nix-env? How do I view logs of what I ever installed through sudo nixos-rebuild switch?

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As far as I can tell nix has no log. I'm guessing the reason for excluding this feature of every-other-package-manager-ever is that nixos is declarative rather than imperative, so the process it went through to get your system from one state to another should be irrelevant.

Which brings us to what I suspect you really want to know: How can I compare the current generation with the last?

I've found nixos-scripts' diff-generations command very helpful for this. For instance, if you're on generation 115, you can get a diff of installed packages with:

nix-script diff-generations -s -n 114..115 
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