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README.md

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 本教程介绍 Linux 命令行 Bash 的基本用法和脚本编程。
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+主要内容:
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+[简介](./docs/intro.md)
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+[基本语法](./docs/grammar.md)
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+[模式扩展](./docs/expansion.md)
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+[引号和转义](./docs/quotation.md)
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+[变量](./docs/variable.md)
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+[字符串操作](./docs/string.md)
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+[算术运算](./docs/arithmetic.md)
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+[行操作](./docs/readline.md)
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+[目录堆栈](./docs/stack.md)
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+[脚本入门](./docs/script.md)
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+[read命令](./docs/read.md)
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+[条件判断](./docs/condition.md)
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+[循环](./docs/loop.md)
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+[函数](./docs/function.md)
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+[数组](./docs/array.md)
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+[set命令](./docs/set.md)
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+[脚本除错](./docs/debug.md)
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+[mktemp命令,trap命令](./docs/mktemp.md)
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+[启动环境](./docs/startup.md)
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+[命令提示符](./docs/prompt.md)