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This article mainly introduces how to use the tee command in Linux, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

Linux tee command

The tee command reads data based on standard input, standard output, or file write data. Feel the syntax of this command:

Tee [OPTION]... [FILE]...

Here is a description of the help documentation:

Copy from standard input to each file and output to standard output.

Let the Q & A style example give us more inspiration and learn more about this command.

Q1. How do I use this command on Linux?

Suppose you are using the ping command for some reason.

Ping google.com

How to use the tee command on Linux

Then at the same time, the information you want to output can be written to the file at the same time. At this time, the tee command has the opportunity to give full play to its talents.

Ping google.com | tee output.txt

The screenshot below shows that this output is not only written to the output.txt file, but also displayed in the standard output.

Tee command output

So you should understand the basic usage of tee.

Q2. How to ensure that the tee command appends information to the file?

By default, using the tee command again under the same file overwrites the previous information. You can change the default settings with the-a command option if you want.

[command] | tee-a [file]

Basically, the-an option forces the tee command to append information to the file.

Q3. How to make tee write to multiple files?

It's very simple. All you have to do is write down the file name.

[command] | tee [file1] [file2] [file3]

For example:

Ping google.com | tee output1.txt output2.txt output3.txt

How to make tee write to multiple files

Q4. How can the output of the tee command be used directly as the input of another command?

With the tee command, you can not only write the output to a file, but also use the output as input to another command. For example, the following command not only stores the file name in the output.txt file, but also lets you know the number of files entered into output.txt through the wc command.

Ls file* | tee output.txt | wc-l

How to make the output of a tee command directly as the input of another command

Q5. How do I use the tee command to improve file write permissions?

If you open the file using the Vim editor and make a lot of changes, then when you try to save the changes, you get an error that makes you realize that it is a file owned by root, which means you need to use sudo permissions to save the changes.

How to use the tee command to improve file write permissions

In this case, you can use the tee command (within Vim) to increase permissions.

W! sudo tee%

The above command will ask you for your root password, and then you can save the changes.

Q6. How do I make tee commands ignore interrupts?

The-I command line option causes the tee command to ignore the interrupt signal (SIGINT) that is usually initiated by the ctrl+c key combination.

[command] | tee-I [file]

This option is especially useful when you want to interrupt the command with ctrl+c while letting the tee command exit gracefully.

Thank you for reading this article carefully. I hope the article "how to use tee commands in Linux" shared by the editor will be helpful to everyone. At the same time, I also hope you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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