-bash: _docker_machine_ps1: 未找到命令

场景：在安装完docker-machine，设置docker-machine命令自动补齐的时候，出现以下错误：

-bash: __docker_machine_ps1: 未找到命令 -bash: _docker_machine_ps1: 未找到命令

解决办法：在~/.bashrc中添加如下三行：

source /etc/bash_completion.d/docker-machine-wrapper.bash
source /etc/bash_completion.d/docker-machine-prompt.bash
source /etc/bash_completion.d/docker-machine.bash

-bash: _docker_machine_ps1: 未找到命令

然后重新进行 source /root/.bashrc

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