[root@computeNode:~]# /nix/store/1yrhn6bxp1xq22d1rwp42kqrgnd9igbi-nixos-rebuild/bin/nixos-rebuild switch --no-build-output -I nixpkgs=https://nixos.org/channels/nixos-unstable/nixexprs.tar.xzwarning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs’ does not exist, ignoring
warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels’ does not exist, ignoring
error: file ‘nixpkgs/nixos’ was not found in the Nix search path (add it using $NIX_PATH or -I), at (string):1:13
building Nix...
warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs’ does not exist, ignoring
warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels’ does not exist, ignoring
error: file ‘nixpkgs/nixos’ was not found in the Nix search path (add it using $NIX_PATH or -I)
warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs’ does not exist, ignoring
warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels’ does not exist, ignoring
error: file ‘nixpkgs/nixos’ was not found in the Nix search path (add it using $NIX_PATH or -I)
warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs’ does not exist, ignoring
warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels’ does not exist, ignoring
error: file ‘nixpkgs’ was not found in the Nix search path (add it using $NIX_PATH or -I)
/tmp/nixos-rebuild.J92uUq/nix
warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs’ does not exist, ignoring
warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels’ does not exist, ignoring
error: file ‘nixpkgs’ was not found in the Nix search path (add it using $NIX_PATH or -I)
building the system configuration...
warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs’ does not exist, ignoring
warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels’ does not exist, ignoring
error: file ‘nixpkgs/nixos’ was not found in the Nix search path (add it using $NIX_PATH or -I)

[root@computeNode:~]#