Unix:混淆 Tee 命令的使用 [英] Unix: confusing use of the Tee -command

问题描述

手册指出三通是管件"工具.这些案例

使用 sudo 并将问题中的示例附加到文件中

ls -l |须藤 tee -a file.txt

Manual states that the tee is a "pipe fitting"-tool. The cases [1] confuse me:

1. case

echo "foo bar" | sudo tee -a /path/to/some/file

2. case

:w !sudo tee %

It is hard to understand the logic of tee from the cases. How does the tee work?

解决方案

tee is normally used to split the output of a program so that it can be both displayed and saved in a file. The command can be used to capture intermediate output before the data is altered by another command or program. The tee command reads standard input, then writes its content to standard output. It simultaneously copies the result into the specified file(s) or variables

tee [OPTION]... [FILE]...

For instance

tee [ -a ] [ -i ]... [ File ]...

• -a Appends the output to the end of File instead of writing over it.

• -i Ignores interrupts.

With sudo and appending to the file with your example in the question

ls -l | sudo tee -a file.txt 

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