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tee
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===
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把数据重定向到给定文件和屏幕上
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## 说明
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**tee命令** 用于将数据重定向到文件，另一方面还可以提供一份重定向数据的副本作为后续命令的stdin。简单的说就是把数据重定向到给定文件和屏幕上
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!
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存在缓存机制，每1024个字节将输出一次。若从管道接收输入数据，应该是缓冲区满，才将数据转存到指定的文件中。若文件内容不到1024个字节，则接收完从标准输入设备读入的数据后，将刷新一次缓冲区，并转存数据到指定文件
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## 选项
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```
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tee(选项)(参数)
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```
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```
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-a：向文件中重定向时使用追加模式
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-i：忽略中断（interrupt）信号
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```
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### 参数
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文件：指定输出重定向的文件
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在终端打印stdout同时重定向到文件中：
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```
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ls | tee out.txt
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1.sh
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1.txt
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2.txt
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eee.tst
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EEE.tst
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one
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out.txt
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string2
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www.pdf
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WWW.pdf
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WWW.pef
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```
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```
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[root@localhost text]# ls | tee out.txt | cat -n
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1 1.sh
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2 1.txt
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3 2.txt
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4 eee.tst
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5 EEE.tst
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6 one
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7 out.txt
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8 string2
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9 www.pdf
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10 WWW.pdf
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11 WWW.pef
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```
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