#!/usr/bin/env EXPECTED_VERSION="${1}" NIX_VERSION_OUTPUT=$(nix --version) NIX_VERSION=$(echo "${NIX_VERSION_OUTPUT}" | awk '{print $NF}') EXPECTED_OUTPUT="nix (Nix) ${EXPECTED_VERSION}" if [ "${NIX_VERSION_OUTPUT}" != "${EXPECTED_OUTPUT}" ]; then echo "Nix version ${NIX_VERSION} didn't match expected version ${EXPECTED_VERSION}" exit 1 else echo "Success! Nix version ${NIX_VERSION} installed as expected" fi