Nixos commands

Update nixos configuration with newest changes to configuration.nix

nixos-rebuild switch

Revert most recent updates if something goes terribly wrong.

nixos-rebuild switch --rollback

list all the installed packages

nix-store --query --references /run/current-system/sw

smth

nix search nixpkgs odbc

search for particular library

ls /nix/store/*/lib/libodbc.so.2