output

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  2399  100  2399    0     0   6397      0 --:--:-- --:--:-- --:--:--  6397
downloading Nix 2.3.3 binary tarball for x86_64-darwin from 'https://nixos.org/releases/nix/nix-2.3.3/nix-2.3.3-x86_64-darwin.tar.xz' to '/var/folders/ms/pt_bh2sx27q8y_xw3gd9_5lm0000gq/T/nix-binary-tarball-unpack.XXXXXXXXXX.4CnnJMHg'...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 26.3M  100 26.3M    0     0  4525k      0  0:00:05  0:00:05 --:--:-- 5213k
Note: a multi-user installation is possible. See https://nixos.org/nix/manual/#sect-multi-user-installation
performing a single-user installation of Nix...
directory /nix does not exist; creating it by running 'mkdir -m 0755 /nix && chown callanmcgill /nix' using sudo
mkdir: /nix: Read-only file system
/var/folders/ms/pt_bh2sx27q8y_xw3gd9_5lm0000gq/T/nix-binary-tarball-unpack.XXXXXXXXXX.4CnnJMHg/unpack/nix-2.3.3-x86_64-darwin/install: please manually run 'mkdir -m 0755 /nix && chown callanmcgill /nix' as root to create /nix
callanmcgill@wards-imac ~ % export NIX_IGNORE_SYMLINK_STORE=1                 
callanmcgill@wards-imac ~ % curl https://nixos.org/nix/install | sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  2399  100  2399    0     0   6380      0 --:--:-- --:--:-- --:--:--  6363
downloading Nix 2.3.3 binary tarball for x86_64-darwin from 'https://nixos.org/releases/nix/nix-2.3.3/nix-2.3.3-x86_64-darwin.tar.xz' to '/var/folders/ms/pt_bh2sx27q8y_xw3gd9_5lm0000gq/T/nix-binary-tarball-unpack.XXXXXXXXXX.thxamMM7'...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 26.3M  100 26.3M    0     0  4420k      0  0:00:06  0:00:06 --:--:-- 5052k
Note: a multi-user installation is possible. See https://nixos.org/nix/manual/#sect-multi-user-installation
performing a single-user installation of Nix...
directory /nix does not exist; creating it by running 'mkdir -m 0755 /nix && chown callanmcgill /nix' using sudo
mkdir: /nix: Read-only file system
/var/folders/ms/pt_bh2sx27q8y_xw3gd9_5lm0000gq/T/nix-binary-tarball-unpack.XXXXXXXXXX.thxamMM7/unpack/nix-2.3.3-x86_64-darwin/install: please manually run 'mkdir -m 0755 /nix && chown callanmcgill /nix' as root to create /nix