-bash: docker-machine: command not found

Docker Machine 則是一個安裝和管理 Docker 的工具。它有自己的命令行工具：docker-machine。

需要安裝Docker Machine 以支持 docker-macine 命令。
Docker Machine官網地址：https://docs.docker.com/machine/install-machine/

安裝步驟：

1、Install Docker.（安裝 Docker，如果已有Docker則跳過此步驟）

2、Download the Docker Machine binary and extract it to your PATH.
安裝Docker Machine。區分不同環境，直接執行命令即可

If you are running on macOS:

$ base=https://github.com/docker/machine/releases/download/v0.14.0 &&
  curl -L $base/docker-machine-$(uname -s)-$(uname -m) >/usr/local/bin/docker-machine &&
  chmod +x /usr/local/bin/docker-machine

If you are running on Linux:

$ base=https://github.com/docker/machine/releases/download/v0.14.0 &&
  curl -L $base/docker-machine-$(uname -s)-$(uname -m) >/tmp/docker-machine &&
  sudo install /tmp/docker-machine /usr/local/bin/docker-machine

If you are running with Windows with Git BASH:

$ base=https://github.com/docker/machine/releases/download/v0.14.0 &&
  mkdir -p "$HOME/bin" &&
  curl -L $base/docker-machine-Windows-x86_64.exe > "$HOME/bin/docker-machine.exe" &&
  chmod +x "$HOME/bin/docker-machine.exe"

The above command works on Windows only if you use a terminal emulator such as Git BASH, which supports Linux commands like chmod.

Otherwise, download one of the releases from the docker/machine release page directly.

3、Check the installation by displaying the Machine version:
執行 docker-machine version命令 檢查是否安裝成功

$ docker-machine version
docker-machine version 0.14.0, build 9371605

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