更新一些笔记
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# 反引号/飘号:\`
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作用:把包裹的内容作为命令执行
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示例:
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- echo \`pwd\`
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# 重定向符 >
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作用:
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- >:将左侧命令的结果,覆盖写入到右侧指定的文件中
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- >>:将左侧命令的结果,追加写入到右侧指定的文件中
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示例:
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- echo "this is a added line" >> test.txt
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