From beginner to proficient: Explore various application scenarios of Linux tee command

Linux tee command is a very useful command line tool. It can write the output to a file or send the output to another command without affecting the existing output. In this article, we will deeply explore the various application scenarios of the Linux tee command, from entry to proficiency.

1. Basic usage

First, let’s take a look at the basic usage of the tee command. The syntax of tee command is as follows:

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

This command will read data from standard input and output the data to the screen. Write data to the specified file. If no file name is specified, data is written to the standard output stream by default.

The following is a simple example:

echo "Hello, world!" | tee output.txt

This command will output the string "Hello, world!" to the screen and written to the output.txt file.

2. Append content to the file

In addition to overwriting data and writing it to the file, the tee command can also append content to the file. This function can be achieved using the -a parameter.

echo "New content" | tee -a output.txt

This command will append the string "New content" to the end of the output.txt file.

3. Used in conjunction with pipes

One of the most common uses of the tee command is to be used in conjunction with pipes to pass the output of the command to the tee command and write the output to a file at the same time.

ls -l | tee filelist.txt

This command will display the output of the ls -l command on the screen and write the output to the filelist.txt file middle.

4. Multiple output

tee command can also write multiple files at one time, just separate the file names with spaces.

cat test.txt | tee file1.txt file2.txt

This command will write the contents of the test.txt file into two files, file1.txt and file2.txt at the same time.

5. Combined application

Finally, we can combine multiple tee commands with other Linux commands to achieve more complex operations.

ps aux | tee process_list.txt | grep root

This command will display the output of the ps aux command simultaneously on the screen and write it to the process_list.txt file , and then filter out the lines containing "root" through the pipeline and display them on the screen.

Conclusion

Through the introduction of this article, you should have a deeper understanding of the Linux tee command. The tee command is a powerful tool that can help us process data output more efficiently in the command line environment. I hope this article can help you understand the various application scenarios of the tee command.

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