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cat-less-more-tail-head-nl.md
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#### cat 显示文件内容
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```
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cat demo.php #在屏幕上显示 demo.php 文件的内容
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cat -n demo.php #查看文件内容并从 1 开始添加序号
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```
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#### less 分屏显示文件内容
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```
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less demo.php #显示 demo.php 文件,退出按 q 键
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```
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补充:Enter(向下翻滚一行),空格(向下滚动一屏),Q(退出命令)
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#### more 和 less 命令类似,也是分屏显示文件内容
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```
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more -10 demo.php #指定没屏显示 10 行内容
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morw +50 demo.php #指定从第 50 行开始显示
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```
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补充:Enter(向下翻滚一行),空格(向下滚动一屏),Q(退出命令)
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#### tail 显示文件尾部的内容
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```
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tail demo.php #默认显示文件尾部 10 行
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tail -2 demo.php #显示文件尾部 2 行
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```
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#### head 显示文件头部内容
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```
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head demo.php #显示文件内容,默认显示 10 行
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head -5 demo.php #显示文件头部 5 行内容
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```
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#### nl 命令
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```
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nl demo.php #查看文件内容并加行号显示
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```
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