def _brew_cmd(env):
    cmd = find_cmd(env, "brew", "--version")
    if cmd is None:
        raise ValueError("Did not find working installation of Linuxbrew/Homebrew. "
                         "Please check if you have ruby available.")
    else:
        return cmd
Return the mtime, last modified time, of a session object.
dataset/ETHPy150Open chapmanb/cloudbiolinux/cloudbio/package/brew.py/_brew_cmd--crossover with--dataset/ETHPy150Open google/simian/src/simian/auth/base.py/AuthSessionBase._Mtime