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#FROM ubuntu
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#CMD echo "This is a test." | wc -
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# wc 命令:计算指定文件(文本)的行数、字数,以及字节数
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#注意:docker run 启动容器后,输出一行内容之后,容器即退出。因为 CMD 中的命令是非阻塞命令。
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FROM ubuntu
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CMD ["/usr/bin/wc","--help"]
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